7. 4 light bulbs were selected from 15, of the 15 there were 5 defectives. What is the probability that 3 of the 4 selected were defective? Also find the mean and variance of the hypergeometric distribution.

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Q: what percent of the students scored higher than 68?

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A: Given that  μ=4σ=9

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Q: What proportion of the distribution of sample means is between a z  of 1.34 and z of -1.00?

A: P(1.34<z<-1.00)=?