The average score on a math test is 75 with a standard deviation of 8. What is the probability that a randomly selected test has a score of 90 or higher? P(z The life of a gas grill is 3.5 years with a standard deviation 0.35 years. What is the probability that the grill will last less than 3 years? P(z Ambulance response times average 7.5 minutes with a standard deviation of 2.5. What is the probability that an ambulance will respond within 6 to 8 minutes.

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A: Hello! Thank you for the question. We'll able to solve only one question as per our honor code.

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A: Step 1: Analyze the problem. Step 2: Check if there's lacking. Step 3: Give a suggestion

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A: Dear student, Since you have posted two questions, as per our policy we will answer first question.…

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A: To use normal approximation, the following conditions should be satisfied. np>5 and n(1-p)>5