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The ratings of a café are normally distributed with an expected value of mu=6 and a...

The ratings of a café are normally distributed with an expected value of mu=6 and a variance of sigma ^2 = 4

The Café changes its rating system (Y) in awful and amazing. Now suppose that 40 people are asked about their opinion and that the probability for a rating with "amazing" is p=0,8

a) how many "amazing" ratings can the café expect ?

b) What is the probability for at least 3 "awful" ratings ?

Math   Statistics-And-Probability   
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