The random variable x is the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office. Its probability distribution is given in the table. Find the standard deviation. House Sold (x) 0 1 2 3 4 5 6 7 Probability P(x) 0.24 0.01 0.12 0.16 0.01 0.14 0.11 0.21 Ⓒa. 4.45 Ob 2.62 Oc. 2.25

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