There are 20 black cell phones and 30 white cell phones in a store. An employee takes 10 phones at random. Find the probability that A. there will be exactly 4 black cell phones among the chosen phones; B. there will be less than 3 black cell phones among the chosen phones.

Question

Alena

Mathematics

21 February, 15:57

There are 20 black cell phones and 30 white cell phones in a store. An employee takes 10 phones at random. Find the probability that A. there will be exactly 4 black cell phones among the chosen phones; B. there will be less than 3 black cell phones among the chosen phones.

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Answers (1)

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Kamren Solomon · Answer 1

A. 0.001 B. 0.012

Step-by-step explanation:

Since it is random selection P (B) = 0.4 and P (W) = 0.6

0.4^4 * (0.6) ^6 (A)

less than 3, can be 0,1 or 2 the probabilities of each will be determine and multiplied