A different species of cockroach has weights that are approximately Normally distributed with a mean of 50 grams. After measuring the weights of many of these cockroaches, a lab assistant reports that 14% of the cockroaches weigh more than 55 grams. Based on this report, what is the approximate standard deviation of weight for this species of cockroaches?

a. 4.6

b. 5.0

c. 6.2

d. 14.0

e. Cannot determine without more information.

Select the best answer.