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4. A large company insists that all job applicants who are invited for an interview take a psychometric test. The results of these tests follow a normal distribution with a mean of 61% and a standard deviation of 7.2%.
a) What proportion of applicants would be expected to score over 70%?
b) What proportion of applicants would be expected to score under 40%?
c) What proportion of applicants would be expected to score between 50% and 65%?

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