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The current gain of certain transistors is measure in units which make it equal to the...

The current gain of certain transistors is measure in units which make it equal to the logarithm of ??/?? , the ratio of the output to the input current. If the ratio, ??/?? , is a lognormal random variable with parameters distributed with ? = 2 and ? 2 = .01, find the probability that ??/?? will take on a value between 6.1 and 8.2.

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