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Cumulative Probability of Continuous VariablesSuppose you work at a sports analysis company and you want to analyse the effect a bowler’s height has on his/her performance. So, you create a list of all 5 wicket hauls in the last decade. Based on this data, they created a cumulative probability distribution for X, where X = height of the bowler who took the 5 wicket haul.Now, based on the data, you conclude that the cumulative probability, F(175.3 cm) = 0.3. In this case, which of the following statements is correct?P(X<175.3 cm) = 0.3P(X<175.3 cm) = 0.3(Remember that height is a continuous variable.)

Question

Cumulative Probability of Continuous VariablesSuppose you work at a sports analysis company and you want to analyse the effect a bowler’s height has on his/her performance. So, you create a list of all 5 wicket hauls in the last decade. Based on this data, they created a cumulative probability distribution for X, where X = height of the bowler who took the 5 wicket haul.Now, based on the data, you conclude that the cumulative probability, F(175.3 cm) = 0.3. In this case, which of the following statements is correct?P(X<175.3 cm) = 0.3P(X<175.3 cm) = 0.3(Remember that height is a continuous variable.)

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Solution

The correct statement is P(X<175.3 cm) = 0.3. This is because the cumulative probability distribution function, F(x), of a random variable X is defined as the probability that X will take a value less than or equal to x. Therefore, F(175.3 cm) = P(X<=175.3 cm) = 0.3 implies that the probability of a bowler's height being less than or equal to 175.3 cm, given that the bowler took a 5 wicket haul, is 0.3.

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