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hba

  • 2 years ago

Stats help required

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

  3. wio
    • 2 years ago
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    ah, so it's just a weighted average.

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

  5. hba
    • 2 years ago
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    Whatt is the general formula @kropot72

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

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

  8. hba
    • 2 years ago
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    @Mimi_x3

  9. saifoo.khan
    • 2 years ago
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    I wrote the general formula already.

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

  11. hba
    • 2 years ago
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    Next.

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

  13. hba
    • 2 years ago
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    What about geometric?

  14. saifoo.khan
    • 2 years ago
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    Geo mean formula: √(xy)

  15. hba
    • 2 years ago
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    Sqrt(x*y)

  16. hba
    • 2 years ago
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    Okay got it

  17. saifoo.khan
    • 2 years ago
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    \[√(xy) = 8.4\]

  18. hba
    • 2 years ago
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    Do i have to solve quad equations?

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

  20. hba
    • 2 years ago
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    I know that

  21. saifoo.khan
    • 2 years ago
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    Now substitute this in the first equation

  22. hba
    • 2 years ago
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    But it would be x=70.56/y

  23. saifoo.khan
    • 2 years ago
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    o_O

  24. hba
    • 2 years ago
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    Whut?

  25. hba
    • 2 years ago
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    sqrt(xy)=8.4 xy=70.56 x=70.56/y

  26. saifoo.khan
    • 2 years ago
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    Oh right.

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

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

  29. saifoo.khan
    • 2 years ago
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    Go for it

  30. hba
    • 2 years ago
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    x=77.16,-56.76 and y=77.16,-56.76

  31. hba
    • 2 years ago
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    I feel like i have made a mistake :/

  32. saifoo.khan
    • 2 years ago
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    Let me check.

  33. hba
    • 2 years ago
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    Should i do it again?

  34. saifoo.khan
    • 2 years ago
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    x = 4.41, y = 15.99 x = 15.99, y = 4.41

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

  36. mathslover
    • 2 years ago
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    may i help?

  37. hba
    • 2 years ago
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    No thanks

  38. mathslover
    • 2 years ago
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    ok do post your answer here

  39. mathslover
    • 2 years ago
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    if you're completed with your soln

  40. hba
    • 2 years ago
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    I will

  41. hba
    • 2 years ago
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    Okay x=15.98,4.414 and y=4.414,15.98

  42. saifoo.khan
    • 2 years ago
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    great.

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

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  44. hba
    • 2 years ago
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    So harmonic mean is 16/5=3.2

  45. hba
    • 2 years ago
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    Right @saifoo.khan ?

  46. saifoo.khan
    • 2 years ago
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    Never heard of harmonic mean. :s

  47. hba
    • 2 years ago
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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.

  48. mathslover
    • 2 years ago
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    I cn help in HM

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

  50. hba
    • 2 years ago
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    @mathslover Do you think my answers are correct?

  51. mathslover
    • 2 years ago
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    lemme check tht .. wait

  52. hba
    • 2 years ago
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    Okay

  53. mathslover
    • 2 years ago
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    yep u r right

  54. mathslover
    • 2 years ago
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    great work

  55. hba
    • 2 years ago
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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?

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

  57. hba
    • 2 years ago
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    Okay now next question.

  58. hba
    • 2 years ago
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    Wait a sec

  59. hba
    • 2 years ago
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  60. saifoo.khan
    • 2 years ago
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    Namaz parhlo.

  61. hba
    • 2 years ago
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    Chalo okay namaz kai baad krtai hai.

  62. hba
    • 2 years ago
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    Han continue karlain @saifoo.khan

  63. hba
    • 2 years ago
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    @AravindG Can you help?

  64. AravindG
    • 2 years ago
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    sorry I am a really busy ...

  65. hba
    • 2 years ago
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    I am really busy*

  66. hba
    • 2 years ago
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    @saifoo.khan I am waiting :/

  67. hba
    • 2 years ago
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    @hartnn Help pleaseeeeeeeeeeeeee

  68. hba
    • 2 years ago
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    @hartnn See the last attachment

  69. hartnn
    • 2 years ago
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    same weighted average formula.

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

  71. hartnn
    • 2 years ago
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    \(\sum_{}^{}fx/\sum_{}^{}f\)

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

  73. hartnn
    • 2 years ago
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    sum of f = 700+800+500

  74. hba
    • 2 years ago
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    Okay thanks :)

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

  76. hba
    • 2 years ago
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    @hartnn

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

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

  79. hartnn
    • 2 years ago
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    yes

  80. hba
    • 2 years ago
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    Okay here we go :D

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  81. hartnn
    • 2 years ago
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    you tried ?

  82. hba
    • 2 years ago
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    Wait wait dont answer i am trying

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

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