The National Coffee Association reported that of U. S. adults drink coffee daily. A random sample of U. S. adults is selected. Round your answers to at least four decimal places as needed. Required:
a. Find the mean μ.
b. Find the standard deviation σ.
c. The standard deviation σ.

The question is incomplete. The complete question is :

The National Coffee Association reported that 62% of U.S. adults drink coffee daily. A random sample of 225 U.S. adults is selected. Round your answers to at least four decimal places as needed.

Required:

a. Find the mean μ.

b. Find the standard deviation σ.

c. The standard deviation σ.

Solution :

a). Percentage of the US adults who drinks coffee daily = 62%

Therefore, the mean, μ = 0.62

b). We know, p = μ = 0.62

And n = 225

Therefore, the standard deviation is given by :

c). Standard deviation, σ = 0.0324

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