finding standard deviation in a normal distribution

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Question description

A different species of cockroach has weights that follow a normal distribution with a mean of 50 grams.After measuring the weights of many of these cockroaches, a lab assistant reports that 14% of the cockroaches weight more than 50 grams.Based on this report, what is the approximate standard deviation of weights for this species of cockraches?

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(Top Tutor) Daniel C.
School: Cornell University
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