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Barbara is a quality control inspector at a shoe factory. At the end of each day, she checks
$2.00$1.00Question: Barbara is a quality control inspector at a shoe factory. At the end of each day, she checks the number of imperfections found in sneakers. The table below represents the probability density function for the random variable X, t imperfections found in sneakers per day. Find the standard deviation of X. Round the final answer to two decimal places
x P(X=x) 0 1/4 2 1/4 4 1/4 7 1/4