Assume that the distributions for the following scenarios are normal. Use the normal standard table to find the following probabilities. Round z
-scores to the nearest hundredth.
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
Answer
Answer
)=
Answer
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
Answer
Answer
)=
Answer
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(
Answer
Answer
z
Answer
Answer
)=
Answer