4. A store has found that 10% of the items it sells are returned after Christmas. On one day, a total of 50 items are sold by 5 clerks: Clerk A sold 5 items, Clerk B sold 20 items, and the rest of the items were sold by the other 3 clerks. a) What is the probability that none of the items sold by Clerk A will be returned? b) What is the probability that exactly 3 of the items sold by Clerk B will be returned? c) What is the probability that between 2 and 7 (inclusively) of the items sold by the other 3 clerks will be returned? d) What is the probability that between 3 and 6 (inclusively) of the items sold by Clerk B and that exactly 4 of the items sold by the other 3 clerks will be returned? answers: 4. a) 0.590 b) 0.190 c) 0.727 d) 0.044

4. A store has found that 10% of the items it sells are returned after Christmas. On one day, a total of 50 items are sold by 5 clerks: Clerk A sold 5 items, Clerk B sold 20 items, and the rest of the items were sold by the other 3 clerks. a) What is the probability that none of the items sold by Clerk A will be returned? b) What is the probability that exactly 3 of the items sold by Clerk B will be returned? c) What is the probability that between 2 and 7 (inclusively) of the items sold by the other 3 clerks will be returned? d) What is the probability that between 3 and 6 (inclusively) of the items sold by Clerk B and that exactly 4 of the items sold by the other 3 clerks will be returned? answers: 4. a) 0.590 b) 0.190 c) 0.727 d) 0.044

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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