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The speeds of a number of bicycles have a normal distribution model with a mean of 83 km/hr and a standard deviation of 9.4 km/hr. Find the probability that a bicycle picked at random is travelling at more than 95 km/hr?(a) 0.1587(b) 0.38(c) 0.49(d) 0/278I have been asked this question in an interview for job.Origin of the question is Probability Distribution topic in section Discrete Probability of Discrete Mathematics

Answer»

Correct choice is (b) 0.38

Explanation: Let x be the random variable that represents the speed of bicycle. x has μ = 90 and σ = 9.5. We have to FIND the probability that x is HIGHER than 95 or P(x > 95). For x = 95, Z = \(\frac{95 – 83}{9.4}\) = 1.27, P(x > 95) = P(z > 1.27) = [total area] – [area to the left of z = 1] = 1 – 0.620 = 0.38. The probability that a car selected at a random has a speed greater than 100 km/hr is EQUAL to 0.38.



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