Question: just need to check my answers Let the random variable X represent the number of purple marbles selected when a group of 4 marbles are

just need to check my answers just need to check my answers Let the random variable X represent

Let the random variable X represent the number of purple marbles selected when a group of 4 marbles are selected from 20 marbles, of which 8 are purple, 6 are sky blue, and 6 are white. The nonhahlitiv maee function X is cliven helnuw. , a) Find the mean , or expected value of the variable X. b) Find the variance 2 and standard devitation for the random variable X

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