The random variable x represents the number of credit cards that adults have along with the corresponding probabilities. Find the mean, the variance and the standard deviation for the discrete probability distribution.

Round all work to the ten-thousandths place (4 places) as needed. If answering as a decimal please put a zero in front of the decimal place. For example record an answer of .2 as 0.2.

State the answer only and no additional work. Make sure to round to the correct place per the above directions. Rounding to the wrong place will result in you missing the question.

x P(x) 0 0.07 1 0.68 2 0.21 3 0.03 4 0.01