Daily number of personal messages sent by employees at a certain company is normally distributed with a mean of 150 and standard deviation of 50. a. What is the probability that a randomly selected...

C and D only please

Extracted text: Daily number of personal messages sent by employees at a certain company is normally distributed with a mean of 150 and standard deviation of 50. a. What is the probability that a randomly selected employee from this company has a daily personal messaging frequency greater than 140? b. What is the probubility that a randomly selected employee from this company has a daily personal messaging frequency between 140 and 180? c. How many of 45 randomly selected employees have a personal messaging frequency less than 170? d. How many of 25 randomly selected employees have a personal messaging frequency less than below 140 or above 180 e. What is the highest personal messaging frequency among the bottom 20% of employees in terms of personal messaging frequency? f. What is the daily personal messaging frequency that separates the top 12% heaviest users from the others? g. What is the 7th decile daily personal messaging frequency? h. What is the first quartile daily personal messaging frequeney? i. What is the IQR of daily personal messaging frequency?