The tree diagram shows a testing procedure on calculators, taken from a large batch. 1 Each time a calculator is chosen at random, the probability that it is faulty (F) is 20

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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4.
Third
Calculator
First
Second
Calculator
Calculator
20
F
-F
20
P
NF
NF
F
-F
NF
19
20
NF
NF
F = faulty
NF = not faulty
20
The tree diagram shows a testing procedure on calculators, taken from a large batch.
Each time a calculator is chosen at random, the probability that it is faulty (F) is
1
20
Answer(d)
In one month, 1000 batches of calculators are tested in this way.
How many batches are expected to be rejected?
Transcribed Image Text:4. Third Calculator First Second Calculator Calculator 20 F -F 20 P NF NF F -F NF 19 20 NF NF F = faulty NF = not faulty 20 The tree diagram shows a testing procedure on calculators, taken from a large batch. Each time a calculator is chosen at random, the probability that it is faulty (F) is 1 20 Answer(d) In one month, 1000 batches of calculators are tested in this way. How many batches are expected to be rejected?
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