kenziewinkler7510
04.11.2020 •
Mathematics
Value of 12% of 215 rupees - (120 rupees / 25.8 rupees / 31.6 rupees / 26.7 rupees)
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Ответ:
Solved using binomial, probability = 5.7%
Step-by-step explanation:
Number of people (N) = 7
Probability of success (using phone) = 63% = 0.63
So, probability of failure (not using phone) = 1 - 0.63 = 37
Number of success (r) = 2
N c r . P^r . Q^n-r
7 c 2 (0.63)^2 (0.37)^5
= 21 (0.3969) (0.0069)
= 0.057