anonymous
  • anonymous
is it $61
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
myininaya
  • myininaya
i want $10000000000
mattfeury
  • mattfeury
Try and post yr replies on the earlier question, otherwise they won't make sense without much context :).
anonymous
  • anonymous
ok thanks

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anonymous
  • anonymous
A student bought five books for the Fall semester. The costs of the books were $52, $70, $73, $63, and $47. Determine the student's average book cost? Determine the standard deviation of the students books? Determine the median price of the students books?
anonymous
  • anonymous
is it $61? Is it $11.25? and is it $63?
amistre64
  • amistre64
61
anonymous
  • anonymous
does anyone know if this is the correct answers?
amistre64
  • amistre64
305/5 = 61
anonymous
  • anonymous
it may be 61. or not. How does one know?
anonymous
  • anonymous
thank you amistre64
anonymous
  • anonymous
do you know I find the standard deviation?
amistre64
  • amistre64
...i think i recall it; how many numbers?
anonymous
  • anonymous
52, 70, 73, 63, 47 (5)
amistre64
  • amistre64
whats the (5) doing there?
anonymous
  • anonymous
total of five books, but you confirmed my answer, thank you.
anonymous
  • anonymous
did you hear of statcrunch?
amistre64
  • amistre64
47-63 = -16 52-63 = -9 63 mean= 0 70-63 = 7 73-63 = 10 squre the results
anonymous
  • anonymous
std deviation is 9.2 i think
amistre64
  • amistre64
256 81 49 100 ---- 486
amistre64
  • amistre64
divide by 5-1? i think now
anonymous
  • anonymous
I got the standard deviation at $11.25, is that incorrect?
amistre64
  • amistre64
486 /4 ---- 121.5
amistre64
  • amistre64
square root that?
anonymous
  • anonymous
oh you may be right, I used the incorrect formula for std deviation
amistre64
  • amistre64
11.02 or so....
anonymous
  • anonymous
I got 11.247, so I rounded it to 11.24?
anonymous
  • anonymous
I meant 11.25
amistre64
  • amistre64
11.25 is close :)
amistre64
  • amistre64
i think i did the steps right lol
amistre64
  • amistre64
i know what i did wrong, i used the median and not the mean lol
anonymous
  • anonymous
A researcher investigated last month's long distance telephone charges for residents of a small city. Ron lives in the city, and the Z-score of his last month's long distance telephone charges was -2.8. Describe Ron's charges as they relate to the average city resident?
anonymous
  • anonymous
Do I use a normal distribution table to find Z?
anonymous
  • anonymous
Ron’s charges represent only .3% of the residents who utilize long distance telephone services. (z-score: 0.0025)
amistre64
  • amistre64
47-61 = 14 196 52-61 = 9 81 63-61 = 2 4 70-61 = 9 81 73-61 = 12 144 ---- 506/4 = 126.5 sqrt(126.5) = 11.247 got it finally lol
anonymous
  • anonymous
thank you, your awesome!
anonymous
  • anonymous
A researcher investigated last month's long distance telephone charges for residents of a small city. Ron lives in the city, and the Z-score of his last month's long distance telephone charges was -2.8. Describe Ron's charges as they relate to the average city resident? Ron’s charges represent only .3% of the residents who utilize long distance telephone services. (z-score: 0.0025)
amistre64
  • amistre64
i havent heard of a z score before...new terminology for me ..
anonymous
  • anonymous
oh ok
anonymous
  • anonymous
do you statistics?
amistre64
  • amistre64
taking stats and calc1 over the summer
anonymous
  • anonymous
:0 ohhhhhhhhhhhhh
amistre64
  • amistre64
taught myself some of it so far, but stats has been a backburner subject for me :)
anonymous
  • anonymous
I know it is difficult, but not impossible

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