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No. & Date AskedQuestion
# 913 :: 12/5/11
Question 913 has been Answered
The mean is 112 oz, and the standard deviation is 40 oz. Compute the probability that the mean from a sample of 49 will fall between 103 and 121 oz. . .

Z-Score, Area between, Standard Error of the Mean

# 897 :: 7/27/11
Question 897 has been Answered
What is the probability for the following values of Z? a. Z < 1.35 b. Z > -1.84 and Z < 2.52 c. Z < 1.02 and Z > 2.77. . .

Area between, Z-Score

# 815 :: 10/5/09
Question 815 has been Answered
Shaver Manufacturing, Inc., offers dental insurance to its employees. A recent study by the human resource director shows the annual cost per employee. . .

Z-Score, Area between

# 794 :: 8/10/09
Question 794 has been Answered
A psychologist has developed a test to measure self-control. The test is normed so that it has a mean of 100 and a standard deviation of 15... The s. . .

Z-Score, Percent Score, Percentile Rank, Area between

# 702 :: 4/26/09
Question 702 has been Answered
A random sample of 100 students who took a statistics exam were asked their score on the exam. The mean score on the test was 50; the standard deviat. . .

Z-Score, Area between

# 559 :: 12/16/08
Question 559 has been Answered
The serum cholesterol levels for men in one age group are normally distributed with a mean of 185.1 and a standard deviation of 37.8. All units are i. . .

Area between, Z-Score

# 558 :: 12/16/08
Question 558 has been Answered
If Z is a standard normal variable, find the probability that z lies between 0.73 and 1.88 or P(0.73

Area between, Z-Score

# 517 :: 11/22/08
Question 517 has been Answered
An executive drives his vehicle from home to work daily. Driving times are normally distributed with a mean of 35 minutes and standard deviation of 8. . .

Z-Score, Area between, above .10

# 500 :: 11/7/08
Question 500 has been Answered
In a recent year grade 8 Washington State public school students taking a mathematics assessment test had a mean score of 276.1 with a standard deviat. . .

Percent Score, Area between, Z-Score

# 494 :: 11/4/08
Question 494 has been Answered
If the average price of a new home is 145,000 what is the minimum and maximum prices of the houses a contractor will need to build to include the midd. . .

Z-Score, Area between

# 484 :: 10/25/08
Question 484 has been Answered
With a normal distribution of 50 and standard deviation of population =10, how do I figure out the score at the 40th percentile? How do I figure out t. . .

Z-Score, Area between, Percent Score

# 390 :: 9/18/08
Question 390 has been Answered
How do you find the normal distribution when the mean is 50 witha standard deviation between scores of 32 and 47?. . .

Area between, Z-Score

# 370 :: 9/6/08
Question 370 has been Answered
The accounting department at Weston reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours... Determin. . .

Area between, Z-Score

# 367 :: 9/5/08
Question 367 has been Answered
find the area under standard normal curve which lies (a) to the right of Z=1.76,(b)to the left of Z=.94,(c)to the right of Z=-.65,(d)b/w Z=.34 & Z=.62. . .

Area between, Z-Score

# 356 :: 8/24/08
Question 356 has been Answered
The mean weight of 500 students is 151 lbs and the standard deviation is 15 lbs. Assuming the weights are normally distributed, find out how many stu. . .

Area between, Z-Score

# 321 :: 8/7/08
Question 321 has been Answered
A normal distributed population has a mean of 250 pounds and a standard deviation of 10 pounds. Given n = 20, what is the probability that this sample. . .

Area between

# 318 :: 8/6/08
Question 318 has been Answered
A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviat. . .

Area between, Z-Score

# 283 :: 7/19/08
Question 283 has been Answered
The lengths of pregnancies are normally distributed with a mean of 264 days and a standard deviation of 25 days. If 100 women are randomly selected, f. . .

Z-Score, Area between