kitchen appliances don't last forever. The lifespan of all microwave ovens sold in the united states is approximately normally distributed with a mean of 9 years and a standard deviation of 2.5 years. what percentage of the ovens last more than 10 years?

a. 11.5%

b. 34.5%

c. 65.5%

d. 69%

e. 84.5%