The Survival Times of Adult Mosquitoes Exposed to a Commonly

Multiple Choice

The survival times of adult mosquitoes exposed to a commonly used synthetic pesticide (Phenothrin) follow a normal distribution, with a standard deviation of 15.18 sec.A random sample of 40 mosquitoes has an average survival time of 47.5 sec.What is a 99% confidence interval for the mean survival time?

A) (41.318, 53.682)
B) (41.916, 53.083)
C) (42.700, 52.300)
D) (8.399, 86.601)