MATH 1342-What was the age distribution of nurses in Great Britain

Question
What was the age distribution of nurses in Great Britain at the time of Florence Nightingale? Suppose we have the following information. Note: In 1851 there were 25,466 nurses in Great Britain.

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 74.5 84.5
Percent of nurses 5.2% 9.6% 19.1% 29.4% 25.4% 9.2% 2.1%

(c) Find the probability that a British nurse selected at random in 1851 would be 60 years of age or older. (Round your answer to three decimal places.)

(d) Compute the expected age ? of a British nurse contemporary to Florence Nightingale. (Round your answer to two decimal places.)
yr

(e) Compute the standard deviation ? for ages of nurses shown in the distribution. (Round your answer to two decimal places.)
yr

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