is it $61

Question

is it $61

myininaya · Answer

i want $10000000000

mattfeury · Answer

Try and post yr replies on the earlier question, otherwise they won't make sense without much context :).

anonymous · Answer

ok thanks

anonymous · Answer

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 · Answer

is it $61? Is it $11.25? and is it $63?

amistre64 · Answer

61

anonymous · Answer

does anyone know if this is the correct answers?

amistre64 · Answer

305/5 = 61

anonymous · Answer

it may be 61. or not. How does one know?

anonymous · Answer

thank you amistre64

anonymous · Answer

do you know I find the standard deviation?

amistre64 · Answer

...i think i recall it; how many numbers?

anonymous · Answer

52, 70, 73, 63, 47 (5)

amistre64 · Answer

whats the (5) doing there?

anonymous · Answer

total of five books, but you confirmed my answer, thank you.

anonymous · Answer

did you hear of statcrunch?

amistre64 · Answer

47-63 = -16
52-63 =   -9
63 mean=  0
70-63 =    7
73-63 =  10

squre the results

anonymous · Answer

std deviation is 9.2 i think

amistre64 · Answer

256
  81
  49
100
----
 486

amistre64 · Answer

divide by 5-1? i think now

anonymous · Answer

I got the standard deviation at $11.25, is that incorrect?

amistre64 · Answer

486
/4
----
121.5

amistre64 · Answer

square root that?

anonymous · Answer

oh you may be right, I used the incorrect formula for std deviation

amistre64 · Answer

11.02 or so....

anonymous · Answer

I got 11.247, so I rounded it to 11.24?

anonymous · Answer

I meant 11.25

amistre64 · Answer

11.25 is close :)

amistre64 · Answer

i think i did the steps right lol

amistre64 · Answer

i know what i did wrong, i used the median and not the mean lol

anonymous · Answer

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 · Answer

Do I use a normal distribution table to find Z?

anonymous · Answer

Ron’s charges represent only .3% of the residents who utilize long distance telephone services. (z-score: 0.0025)

amistre64 · Answer

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 · Answer

thank you, your awesome!

anonymous · Answer

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 · Answer

i havent heard of a z score before...new terminology for me ..

anonymous · Answer

oh ok

anonymous · Answer

do you statistics?

amistre64 · Answer

taking stats and calc1 over the summer

anonymous · Answer

:0  ohhhhhhhhhhhhh

amistre64 · Answer

taught myself some of it so far, but stats has been a backburner subject for me :)

anonymous · Answer

I know it is difficult, but not impossible