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Chapter 13 Class 12 Probability

Example 35 - Probability of a shooter hitting target is 3/4. How many

Example 35 - Chapter 13 Class 12 Probability - Part 2
Example 35 - Chapter 13 Class 12 Probability - Part 3

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Question 13 The probability of a shooter hitting a target is 3/4 . How many minimum number of times must he/she fire so that the probability of hitting the target at least once is more than 0.99?Let X : Number of times he hits the target Hitting the target is a Bernoulli trial So, X has a binomial distribution P(X = x) = nCx 𝒒^(π’βˆ’π’™) 𝒑^𝒙 Here, n = number of rounds fired p = Probability of hitting = 3/4 q = 1 – p = 1 βˆ’ 3/4 = 1/4 Hence, P(X = x) = nCx (πŸ‘/πŸ’)^𝒙 (𝟏/πŸ’)^(π’βˆ’π’™) We need to find How many minimum number of times must he/she fire so that the probability of hitting the target at least once is more than 0.99 So, given P(X β‰₯ 1) > 99%, we need to find n Now, P(X β‰₯ 1) > 99 % 1 βˆ’ P(X = 0) > 99 % ` 1 βˆ’ nC0(3/4)^0 (1/4)^𝑛> 0.99 1 βˆ’ (1/4)^𝑛 > 0.99 1 βˆ’ 0.99 > (1/4)^𝑛 0.01 > 1/4^𝑛 4^𝑛 > 1/0.01 πŸ’^𝒏 > 𝟏𝟎𝟎 We know that 44 = 256 So, n β‰₯ 4 So, the minimum value of n is 4 So, he must fire atleast 4 times `

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