# A certain type of flashlight requires two type-D ## Problem 57E Chapter 3

Probability and Statistics for Engineering and the Sciences | 9th Edition

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Problem 57E

A certain type of flashlight requires two type-D batteries, and the flashlight will work only if both its batteries have acceptable voltages. Suppose that 90% of all batteries from a certain supplier have acceptable voltages. Among ten randomly selected flashlights, what is the probability that at least nine will work? What assumptions did you make in the course of answering the question posed?

Step-by-Step Solution:

Answer Step 1 of 2 Given n=10, For 2 batteries P=0.9*0.9 =0.81 q=1-p =1-0.81 =0.19 Let x= no. of batteries working Here X~B(10,0.81) The pmf of binomial distribution is P(x)=(n c(p )(q ), x=0,1,2……..,n

Step 2 of 2

##### ISBN: 9780321629111

Probability and Statistics for Engineering and the Sciences was written by and is associated to the ISBN: 9780321629111. The answer to “A certain type of flashlight requires two type-D batteries, and the flashlight will work only if both its batteries have acceptable voltages. Suppose that 90% of all batteries from a certain supplier have acceptable voltages. Among ten randomly selected flashlights, what is the probability that at least nine will work? What assumptions did you make in the course of answering the question posed?” is broken down into a number of easy to follow steps, and 63 words. The full step-by-step solution to problem: 57E from chapter: 3 was answered by , our top Statistics solution expert on 05/06/17, 06:21PM. Since the solution to 57E from 3 chapter was answered, more than 291 students have viewed the full step-by-step answer. This full solution covers the following key subjects: batteries, type, Voltages, flashlight, acceptable. This expansive textbook survival guide covers 18 chapters, and 1582 solutions. This textbook survival guide was created for the textbook: Probability and Statistics for Engineering and the Sciences, edition: 9.

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