In a growing industry, the mean number of hours of productivity lost by employees per week due to online social media engagement is 7 hours, with a standard deviation of 2.3 hours.

Note: Assume the population data is normally distributed.

Standard Normal Distribution Table

a. What is the probability that an employee will lose more than 9 hours of productivity due to online social media engagement?

P(X>9)=(>9)=

Round to four decimal places if necessary

b. What is the probability that 11 employees will lose more than 8 hours of productivity due to online social media engagement?

P(X>8)=(X>8)=

Round to four decimal places if necessary