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hba

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  • one year ago
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  1. hba
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    • one year ago
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  2. saifoo.khan
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    \[mean = \frac{\sum fx}{\sum x}\]

    • one year ago
  3. wio
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    ah, so it's just a weighted average.

    • one year ago
  4. kropot72
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    Solve the following for x: \[\frac{12(x-5)+40x+8(x+5)}{60}=10\]

    • one year ago
  5. hba
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    Whatt is the general formula @kropot72

    • one year ago
  6. ParthKohli
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    \[\dfrac{\underbrace{x - 5 + x - 5 \cdots+ x-5}_{\rm 12 ~times} + \underbrace{x + x\cdots x + x}_{\rm 40 ~ times} + \underbrace{x + 5 +\cdots+ x+5}_{\rm 8 ~times}}{12 + 40 + 8}\]

    • one year ago
  7. hba
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    Thanks a lot but there would be some general form of this :/

    • one year ago
  8. hba
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    @Mimi_x3

    • one year ago
  9. saifoo.khan
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    I wrote the general formula already.

    • one year ago
  10. hba
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    Shouldnt it be, \[\sum_{}^{}fx/\sum_{}^{}f\]

    • one year ago
  11. hba
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    Next.

    • one year ago
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  12. saifoo.khan
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    \[Arithmetic => \frac{x+y}{2} = 10.2\]

    • one year ago
  13. hba
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    What about geometric?

    • one year ago
  14. saifoo.khan
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    Geo mean formula: √(xy)

    • one year ago
  15. hba
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    Sqrt(x*y)

    • one year ago
  16. hba
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    Okay got it

    • one year ago
  17. saifoo.khan
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    \[√(xy) = 8.4\]

    • one year ago
  18. hba
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    Do i have to solve quad equations?

    • one year ago
  19. saifoo.khan
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    take square on both sides: xy = sqrt8.4 x = sqrt(8.4)/y

    • one year ago
  20. hba
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    I know that

    • one year ago
  21. saifoo.khan
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    Now substitute this in the first equation

    • one year ago
  22. hba
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    But it would be x=70.56/y

    • one year ago
  23. saifoo.khan
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    o_O

    • one year ago
  24. hba
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    Whut?

    • one year ago
  25. hba
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    sqrt(xy)=8.4 xy=70.56 x=70.56/y

    • one year ago
  26. saifoo.khan
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    Oh right.

    • one year ago
  27. saifoo.khan
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    Actually i'm doing two things at once. XD

    • one year ago
  28. hba
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    No worries c:,This thing is going into a quad equation :(

    • one year ago
  29. saifoo.khan
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    Go for it

    • one year ago
  30. hba
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    x=77.16,-56.76 and y=77.16,-56.76

    • one year ago
  31. hba
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    I feel like i have made a mistake :/

    • one year ago
  32. saifoo.khan
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    Let me check.

    • one year ago
  33. hba
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    Should i do it again?

    • one year ago
  34. saifoo.khan
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    x = 4.41, y = 15.99 x = 15.99, y = 4.41

    • one year ago
  35. hba
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    Lemme do it again,Stop playing with wolf :/

    • one year ago
  36. mathslover
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    may i help?

    • one year ago
  37. hba
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    No thanks

    • one year ago
  38. mathslover
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    ok do post your answer here

    • one year ago
  39. mathslover
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    if you're completed with your soln

    • one year ago
  40. hba
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    I will

    • one year ago
  41. hba
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    Okay x=15.98,4.414 and y=4.414,15.98

    • one year ago
  42. saifoo.khan
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    great.

    • one year ago
  43. hba
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    Now next question, I am getting b=2,b=8 and a=8,a=2

    • one year ago
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  44. hba
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    So harmonic mean is 16/5=3.2

    • one year ago
  45. hba
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    Right @saifoo.khan ?

    • one year ago
  46. saifoo.khan
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    Never heard of harmonic mean. :s

    • one year ago
  47. hba
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    Okay lets call someone else for that case,What about the observation do you think they are right? Btw,A.M is opposite of H.M.

    • one year ago
  48. mathslover
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    I cn help in HM

    • one year ago
  49. hba
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    And, H.M=N/(1/a1+1/a2+......1/an)

    • one year ago
  50. hba
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    @mathslover Do you think my answers are correct?

    • one year ago
  51. mathslover
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    lemme check tht .. wait

    • one year ago
  52. hba
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    Okay

    • one year ago
  53. mathslover
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    yep u r right

    • one year ago
  54. mathslover
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    great work

    • one year ago
  55. hba
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    Thanks but now i want to ask, As i have two diff observations a=8,b=2 and a=2,b=8 and the HM is same so should i show this two times?

    • one year ago
  56. mathslover
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    yes you have to mention that it will be same in both cases

    • one year ago
  57. hba
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    Okay now next question.

    • one year ago
  58. hba
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    Wait a sec

    • one year ago
  59. hba
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    • one year ago
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  60. saifoo.khan
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    Namaz parhlo.

    • one year ago
  61. hba
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    Chalo okay namaz kai baad krtai hai.

    • one year ago
  62. hba
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    Han continue karlain @saifoo.khan

    • one year ago
  63. hba
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    @AravindG Can you help?

    • one year ago
  64. AravindG
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    sorry I am a really busy ...

    • one year ago
  65. hba
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    I am really busy*

    • one year ago
  66. hba
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    @saifoo.khan I am waiting :/

    • one year ago
  67. hba
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    @hartnn Help pleaseeeeeeeeeeeeee

    • one year ago
  68. hba
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    @hartnn See the last attachment

    • one year ago
  69. hartnn
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    same weighted average formula.

    • one year ago
  70. hartnn
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    (700*8.5+800*7.5+500*8)/2000

    • one year ago
  71. hartnn
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    \(\sum_{}^{}fx/\sum_{}^{}f\)

    • one year ago
  72. hba
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    I was thinking about using this but i am not getting why is sum of f=2000

    • one year ago
  73. hartnn
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    sum of f = 700+800+500

    • one year ago
  74. hba
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    Okay thanks :)

    • one year ago
  75. hba
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    I am getting mean=7.85,Am i right? @mathslover

    • one year ago
  76. hba
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    @hartnn

    • one year ago
  77. hba
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    Close enough lol :P I am using a casio scientific calculator,I dont know why it rounded the answers :/

    • one year ago
  78. hba
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    Oh yeah i checked it again,Its 7.95 thanks. I have another question may i ask? @hartnn

    • one year ago
  79. hartnn
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    yes

    • one year ago
  80. hba
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    Okay here we go :D

    • one year ago
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  81. hartnn
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    you tried ?

    • one year ago
  82. hba
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    Wait wait dont answer i am trying

    • one year ago
  83. hba
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    \[\sum_{i=1}^{n}a_i=16.2\] Okay @hartnn Please explain

    • one year ago
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