Question

15. A coin is tossed n times. The probability of getting head at least once is greater than 0.8. Then the least value of n is :
(b) 3
(C) 4
(d) 5
(a) 2​

Answer 1

Answer:

c 4

Step-by-step explanation:

Answer 2

$\huge{\boxed{\overline{\underline{\mathfrak{\fcolorbox{cyan}{blue}{Answer}}}}}}$

=> n = 3

Given:

•Let x follows binomial distribution with parameter n, and probability of getting head, p = 1/2

According to the given condition

p(x > 1) > 0.8

=> b p(x = 0) < 0.2

=> nCo (1/2)^n < 0.2

=> 2^n > 5

$least \: value \: of \: n \: = 3$

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