a sample size 85 will be drawn from a population with mean 22 and standard deviation 8. find the probability that x will be between 21 and 24
a sample size 85 will be drawn from a population with mean 22 and standard deviation 8. find the probability that x will be between 21 and 24
A certain car model has a mean gas mileage of 34 miles per gallon (mpg) with a standard deviation 5 mpg. A pizza delivery company buys 49 of these cars. What is the probability that the average mileage...
A certain car model has a mean gas mileage of 33 miles per gallon (mpg) with a standard deviation 3 mpg. A pizza delivery company buys 40 of these cars. What is the probability that the average mileage...
The mean number of pets per household is 3.25 with standard deviation 1.3. A sample of 59 households is drawn. Find the 74th percentile of the sample mean.
A ferry will safely accommodate 70 tons of passenger cars. Assume that the mean weight of a passenger car is 1.8 tons with standard deviation 0.7 tons. If a random sample of 35 cars are loaded onto...
The mean annual income for people in a certain city (in thousands of dollars) is 46, with a standard deviation of 44. A pollster draws a sample of 39 people to interview. What is the probability that...
The average age of doctors in a certain hospital is 43.0 years old. Suppose the distribution of ages is normal and has a standard deviation of 10.0 years. If 25 doctors are chosen at random for a...
The mean weight of loads of rock is 50.0 tons with a standard deviation of 12.0 tons. If 16 loads are chosen at random for a weight check, find the probability that the mean weight of those loads...
A sample of size 35 will be drawn from a population with mean 89 and standard deviation 5. Find the 12th percentile of x.
On an easy test, the mean score was 98 out of a possible 100 points. The distribution of the test scores is likely to be
The weights of 6-week-old poults (juvenile turkeys) are normally distributed with a mean 9.1 pounds and standard deviation 1.6 pounds. A turkey farmer wants to provide a money-back guarantee that...
A bottler of drinking water fills plastic bottles with a mean volume of 999 milliliters (mL) and standard deviation 6 mL. The fill volumes are normally distributed. What proportion of bottles have...
A bottler of drinking water fills plastic bottles with a mean volume of 1007 milliliters (mL) and standard deviation 7 mL. The fill volumes are normally distributed. What proportion of bottles have...
a normal population has a mean of 28 and a standard deviation of 9. What is the probability that a randomly chosen value will be greater than 26?
a normal population has a mean of 39 and a standard deviation of 9. What proportion of the population is less than 34?
For a normal distribution curve with a mean of 17 and a standard deviation of 3, which range of the variable defines an area under the curve corresponding to a probability of approximately 68%?
One normal curve has a mean of 22 and a standard deviation of 3. A second normal curve has a mean of 3 and a standard deviation of 22. The curve that is more dispersed, or spread out, is
A coin is tossed 72 times. Find the standard deviation for the number of heads that will be tossed
It has been estimated that only about 30% of California residents have adequate earthquake supplies. Suppose you randomly survey 11 California residents. We are interested in the number who have adequate...
Determine the indicated probability for a binomial experiment with the given number of trials n and the given success probability p. n = 11, p = 0.5, P(9 or more)