Calculate the standard deviation for ages of British nurses in 1851 if the mean is 53.75. Suppose that the table below shows the age distribution of nurses in Great Britain in 1851. Round your answers to the nearest hundredth.
Age range (yr) 20 - 29 30 - 39 40 - 49 50 - 59 60 - 69 70 - 79 80+
Midpoint (x) 24.5 34.5 44.5 54.5 64.5 75.5 84.5
Percent of nurses 5.8% 9.8% 19.5% 29.1% 25.1% 9.1% 1.6%
Answer
a. 1.53
b. 17.25
c. 3.27
d.1.24
e. 13.64