TS EAMCET · Maths · Probability
An executive in a company makes on an average telephone calls per hour at a cost of Rs. per call. The probability that in any hour the cost of the calls exceeds a sum of Rs. is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
The number of calls per hour is the random variable with mean 5. The required probability of the call cost that exceeds 42 in an hour ⇒Pr>2=1-Pr≤2 =1-e-5+e-551!+e-5522! =1-e-51+5+252 =1-1e5372 ∴ Pr>2=2e5-372e5
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