A random va a. Calculate the following probabilities below for the distribution. 1. P(x ≤20) 2. P(x≤30) 3. P(x≤25) 4. P(x=28) b. What are the mean and standard deviation of this distribution? ... To an a. 1. P(x≤20) = 0.250 (Type an integer or decimal rounded to three decimal places as needed.) a. 2. P(x≤30) = 0.750 (Type an integer or decimal rounded to three decimal places as needed.) a. 3. P(x≤25) = 0.500 (Type an integer or decimal rounded to three decimal places as needed.) a. 4. P(x=28) = (Type an integer or decimal rounded to three decimal places as needed.) 35.

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