The speeds of a random sample of 100 cars are recorded as they pass a highway checkpoint. The results are summarized in the frequency distribution below. Approximate the sample mean. Speed (mph) Cars 30-39 3 40-49 17 T 50-59 50 60-69 16 70-79 14 OA. 56.6 mph OB. 59.4 mph OC. 54.5 mph O D. 62.3 mph

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A: According to policy we answer 3 part kindly repost for remaining.

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A: Solution To find the confidence interval we will use the z distribution i.e. z critical value.

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A: Formula : coefficient of variation= (standard deviation /mean)

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Q: (d) H₂: p < 0.7, z = 0.23

A: To find: P value

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A: given data P(A or B) = 1/4 P(A) = 1/8 P(A and B) = 1/9 P(B) = ?

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A: 11) From the critical value calculator, Hence, Option C is the answer.

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A: The total frequency is 30.

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A: Here  Standard deviation of sample mean = σn

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Q: W|X 3 1.9 6 4.4 у 18.72 18.72 18.72 18.72

A: Given data is :

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Q: A random variable that can be used of the gamma distribution is

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