April 2024
Intermediate to advanced
824 pages
36h 45m
English
Content preview from Business Statistics
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Chapter 5 | Probability 177
Solution
1. If two picture tubes are drawn at random, one at a time without replacement, then the required
probability will be
(Probability that the rst picture tube is drawn and it is defective) × (Without replacing the rst,
the second picture tube is drawn and it is defective)
10 9
(0.7 0.130) 0.091
70 69
= × = × =
2. If two picture tubes are drawn at random, one at a time with replacement, then the required
probability will be
(Probability that the rst picture tube is drawn and it is defective) × (Replacing the rst, the
second picture tube is drawn and it is a defective)
10 10
(0.7 0.7) 0.49
70 ...