Mathematics, 03.05.2021 06:20 FailingstudentXD

3. Number of Credit Cards A bank vice president feels that each savings account customer has, on average,
three credit cards. The following distribution represents
the number of credit cards people own. Find the mean,
variance, and standard deviation. Is the Vice President
correct?
Number of
card
X
5 6 7 8 9 10
P(x) 0.05 0.2 0.4 0.1 0.15 0.1

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