Question

Which of these formulas gives the standard deviation for Jordyn's app data?

a) (21-8)^2 + (28-8)^2 + ... + (70-8)^2 / 7
b) (21-47)^2 + (28-47)^2 + ... + (70-47)^2 / 8
c) (21-8) + (28-8) + ... + (70-8) / 8
d) (21-8) + (28-8) + ... + (70-8) / 11

Answer 1

Formula (a) is used to calculate the standard deviation for Jordyn's app data.

Step-by-step explanation:

The standard deviation for Jordyn's app data can be found using formula (a).

Formula (a) is (21-8)^2 + (28-8)^2 + ... + (70-8)^2 / 7.

This formula calculates the squared difference between each data point and the mean, then divides the sum by the number of data points (in this case, 7) and takes the square root.