a) Compute the mean number of credit cards owned by an adult in this country.

b) Compute the standard deviation.

Suppose that the following table contains the complete probability distribution for the number of credit cards owned by adults in a certain country. Complete parts a and b to the right. Number of Credit Cards (x,) P(x) 0.34 0.16 0.13 3 0.11 4 0.08 0.06 6. 0.05 7 0.04 8. 0.02 0.01 O12 345 6709