The numbers of rooms for 15 homes recently sold were (mean = 7.4):
8, 8, 8, 5, 9, 8, 7, 6, 6, 7, 7, 7, 7, 9, 9

-What is the standard deviation?
A)1.183
B)1.400
C)4.00
D)16.00
E)1.96

Question

The numbers of rooms for 15 homes recently sold were (mean = 7.4):
8, 8, 8, 5, 9, 8, 7, 6, 6, 7, 7, 7, 7, 9, 9

-What is the standard deviation?
A)1.183
B)1.400
C)4.00
D)16.00
E)1.96

Quizplus · Accepted Answer

The standard deviation is calculated by finding the square root of the average of the squared deviations from the mean. For this data set, the mean is 7.4. The deviations from the mean are squared, summed, divided by the number of observations, and then the square root of that result is taken. The correct calculation leads to a standard deviation of approximately 1.183.

The Numbers of Rooms for 15 Homes Recently Sold Were