Assume that the distributions for the following scenarios are normal. Use the normal standard table to find the following probabilities. Fill in blanks, round z-scores to the nearest hundredth. 1) 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 > ______) = _________ 2) 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 < -1.43) = _________ 3) 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. P(_____ < z < ______) = 0.3050
Assume that the distributions for the following scenarios are normal. Use the normal standard table to find the following probabilities. Fill in blanks, round z-scores to the nearest hundredth.
1) The average score on a math test is 75 with a standard deviation of 8. What is the
P(z > ______) = _________
2) 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 < -1.43) = _________
3) 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.
P(_____ < z < ______) = 0.3050
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