The Time needed to complete a production process is normally distributed with a mean of 120 minutes and standard deviation of 20 minutes . Answer the following questions .

a. What is the probability of completing the production process in one and a half hour or less (to 4 decimals )?

b. What is the probability that a student will complete the production in more than one and a half hours but less than 100 minutes?

c. Assume that the factory has 90 products that need to go through this production process in 140 minutes . How many products do you expect will be unable to complete the production process in the allotted time ( to nearest whole number)?

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