Question

how do you find how many standard deviations are within a mean?

Answer 1

is that all the question asks?

Answer 2

the exact question is within how many standard deviations of the mean is the cost of $50. The standard deviation is 21.5

Answer 3

what value do they give for the mean?

Answer 4

91

Answer 5

first we subtract the mean 91 from the cost of 50

50 - 91 = -41

this negative number tells us we are below the mean

Answer 6

then we divide the difference by the std deviation

-41/21.5 = -1.9069767

which is approximate

Answer 7

so you are roughly 1.9069767 standard deviations below the mean

Answer 8

this is using the formula

z = (x - mu)/sigma


x = raw score
mu = mean
sigma = standard deviation
z = z-score

Answer 9

Ok thank you that helped a lot.

Answer 10

you're welcome