A geologist has collected 19 specimens of basaltic rock and 19 specimens of gran

Question

A geologist has collected 19 specimens of basaltic rock and 19 specimens of granite. The geologist instructs a laboratory assistant to randomly select 33 of the specimens for analysis. (a) What is the pmf of the number of granite specimens selected for analysis? (Round your probabilities to four decimal places.) 14 15 16 17 1819 p(x)0.02320.14670.33010.3301 (b) What is the probability that all specimens of one of the two types of rock are selected for analysis? (Round your answer to four decimal places.) 0.04633 (c) What is the probability that the number of granite specimens selected for analysis is within 1 standard deviation of its mean value? (Round your answer to four decimal places.)

Explanation / Answer

P( that number of selected species is within 1 standard deviation) can be aproximated from normal distribution since n>30.

P(-1<z<1)=1-2*0.158655=0.68269

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