Question

Pleas show work for C and D.

The data set below gives the waiting times (in minutes) of several people at a department of motor vehicles service center 11, 7, 14, 2, 8, 13, 3,6, 10, 3, 8, 4, 8, 4,7 d. The data set below gives the calories in a 1-ounce serving of several breakfast cereals. 135, 115, 120, 110, 110, 100, 105, 110, 125

Answer 1

c.

S = Sum of waiting times = 11 + 7 + 14 + 2 + 8 + 13 + 3 + 6 + 10 + 3 + 8 + 4 + 8 + 4 + 7 = 108

n = number of counts = 15

Mean waiting time is given as

= S/n = 108/15 = 7.2

c. S = Sum of waiting times = 11 + 7 + 14 + 2 + 8 + 13 + 3 + 6 + 10 + 3 + 8 + 4 + 8 + 4 + 7 = 108 n = number of counts = 15 Mean waiting time is given as X^- = S/n = 105 = 8/15 = 7.2 Variance = sigma (X - X^-)^2/n - 1 = 188.4/(15 - 1) = 13.5 Standard deviation = squareroot (variance) = squareroot (13.5) = 3.7

Variance = $\frac{\sum (X - \bar{X})^{2}}{n-1}$ = 188.4/(15-1) = 13.5

standard deviation = sqrt(variance) = sqrt(13.5) = 3.7