(Answered) A geologist has collected 10 specimens of basaltic rock and

Statistics

A geologist has collected 10 specimens of basaltic rock and 10 specimens of granite. The geologist instructs a laboratory assistant to randomly 12 of the specimens for analysis.

(a) What is the probability that all specimens of one of the two types of rock are selected for analysis?

(b) What is the probability that the number of granite specimen selected for analysis is within 1 standard deviation of its mean value?

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