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What is the chance of observing a mean

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Suppose the age (years) of customers at US Apple retail stores has μ = 30 and σ2 = 144. Please round your answer to two decimals (e.g., 0.752 becomes 0.75), or indicate cannot be determined if there isn't sufficient information to find the answer.

1. What proportion of customers is expected to be 40 or older?

2. Based on a sample of 32 customers, the mean age is 34. What is the chance of observing a mean of 34 or higher (based on samples of size 32)?

3. Based on a sample of 32 customers, the median age is 28. What is the chance of observing a median of 28 or higher (based on samples of size 32)?

Reference no: EM132851806

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