Suppose that 90% of the batteries from a certain brand have acceptable voltage. These batteries are used on a specific flashlight which requires two batteries to work. The flashlight works only if both batteries have acceptable voltages. We take a random sample of 10 flashlights. Let X be the number of flashlights that work out of the 10 in our sample. Find: (a) the distribution of X. (b) the probability that at least 9 of them will work.

Suppose that 90% of the batteries from a certain brand have acceptable voltage. These batteries are used on a specific flashlight which requires two batteries to work. The flashlight works only if both batteries have acceptable voltages. We take a random sample of 10 flashlights. Let X be the number of flashlights that work out of the 10 in our sample. Find: (a) the distribution of X. (b) the probability that at least 9 of them will work.

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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