AP Statistics Review Chapters

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 55 grams. Based on this report, what is the approximate standard deviation of weights for this species of cockroaches?

• 4.6

• 5.0

• 6.2

• 14.0

• cannot be determined

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