If a normal has a mean of 38.0 and a standard deviation of 1.25, what is the value of the random variable X that has an area to its right equal to 0.3121
If a normal has a mean of 38.0 and a standard deviation of 1.25, what is the value of the random variable X that has an area to its right equal to 0.3121
If a normal has a mean of 33.7 and a standard deviation of 10.5, what is the value of the random variable X that has an area to its left equal to 0.9904?
During the fall season of racing at Dover International Speedway, the mean speed of the cars racing there was found to be 158.9 mph with a standard deviation of 6.7 mph. What speed represents the 30th percentile for speeds of race cars at Dover Speedway? Assume that the racing speeds are
Suppose that preschoolers spend a mean of 25 hours per week in daycare with a standard deviation of 5 hours per week. A newspaper journalist wants to point out that preschoolers are staying in daycares too long, from his perspective. If he only looks at the extreme of the distribution, that is the top 3%, what's the minimum number of hours per week those preschoolers spend in daycare? Assume that the number of hours per week that preschoolers spend in daycare are normally distributed.
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