A random sample of 40 hotel reviews is drawn from a large population of hotel cu

Question

A random sample of 40 hotel reviews is drawn from a large population of hotel customers. It's known that 30% of the population left the hotel 1 star, 20% left 2 stars, 20% left 3 stars, and 30% left 4 stars. Give the standard deviation of the hotel's star rating.      A. .1893 B. .1934 C. .1891 D. .1904 A random sample of 40 hotel reviews is drawn from a large population of hotel customers. It's known that 30% of the population left the hotel 1 star, 20% left 2 stars, 20% left 3 stars, and 30% left 4 stars. Give the standard deviation of the hotel's star rating.      A. .1893 B. .1934 C. .1891 D. .1904

Explanation / Answer

Ans:

standard deviation=sqrt(58/40)=1.204

x f x*f (x-2.5)^2*f 1 12 12 27 2 8 16 2 3 8 24 2 4 12 48 27 Total 40 100 58 mean= 2.5

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