(a) (i)A survey found that one out of five Americans say he or she has visited a doctor in any given month. If 10 people are selected at random, find the binomial probability that exactly 4 will have visited a doctor last month. (ii) A sales firm receives, on average, 4 calls per hour on its toll-free number. For any given hour, find the probability that it will receive less than equal 3 calls. (b) Full-time Ph.D. students receive an average of $12,837 per year. If the average salaries are normally distributed with a standard deviation of $1500, find these probabilities. (i). The student makes more than $14,000. (ii). The student makes between $13,000 and $15,000.

(a) (i)A survey found that one out of five Americans say he or she has visited a doctor in any given month. If 10 people are selected at random, find the binomial probability that exactly 4 will have visited a doctor last month. (ii) A sales firm receives, on average, 4 calls per hour on its toll-free number. For any given hour, find the probability that it will receive less than equal 3 calls. (b) Full-time Ph.D. students receive an average of $12,837 per year. If the average salaries are normally distributed with a standard deviation of $1500, find these probabilities. (i). The student makes more than $14,000. (ii). The student makes between $13,000 and $15,000.

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A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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