The dean has observed for several years and found that the probability distribution of the salary of the alumni

The dean has observed for several years and found that the probability distribution of

for several years and found that the probability distribution of the salary of the alumni s first job after graduation is

The dean has observed for several years and found that the probability

distribution of the salary of the alumni s first job after graduation is

The dean has observed for several years and found

The dean has observed

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4. The dean has observed for several years and found that the probability distribution of the salary of the alumni's first job after graduation is normal, with a mean of $50k per year and a standard deviation of $5k. Please show all work, as I want to learn this skill.
(a) What's the probability that the alumni get a salary of $45k or more in their first jobs?
(b) What's the chance that the alumni get a salary between $35k and $55k?
(c) What is the salary range that 95% of the alumni should be belonged to?

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The dean has observed for several years and found that the probability distribution of the salary of the alumni's first job after graduation is

4. The dean has observed for several years and found that the probability distribution of the salary of the alumni's first job after graduation is