I researched the winning time for the 1/4 mile race in the Fayette County Fair. Let's assume that winning times are normally distributed for both men and women. The mean time for men is 43.92s with a standard deviation of 0.38s. The men's fastest time has a z-score of -1.95. What is the time associated with men's z-score?

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You received a 74% on a quiz. You are curious about how you did in the class overall and want to know the percentile rank. You got the mean the standard deviation from the quiz. X=74.00  X Bar= 79.90 SD= 13.60 1) find the z-score, then identify your percentile rank in the class.     you found out friend number 1 did better than you on this test getting a 77%. However, both of you are in the same communications class and you did better than friend number 1. You did better than them by scoring a 78% on the communication test your friend got a 72% on the communications test. The stats are  X Bar= 73.90   SD=20.10  Figure out if you performed better than your friend averaging across both exams  2) calculate the z-score for your communication test performance 3) Next calculate the z-score that represents your friend's performance on the communications test  4)Now average the z-scores for each person to determine how each person performed on average on the test combined  5) Lastly compare…

The distribution for the time a patient of a medical center spends waiting for an appointment is normal with mean of 35 minutes and standard deviation of 12 minutes. What wait times represents the middle 55% of all appointments?

Two thousand students took an exam. The scores on this exam are Normally distributed with mean =81 points and standard deviation =15 points. Then the middle 50% of the exam scores are between what two values?

If the mean snowfall for Ottawa Ontario Canada is 98 inches per year and the standard deviation is 25 inches what percentage of the time does Ottawa receive less than 125 inches of snow?

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation 20. Find Upper P 4 which is the IQ score separating the bottom 44​% from the top 96​%.

My mean is 104 and the standard deviation is 24.   At least 36% of the scores fall between what 2 values?     I am stuck, please help!

The scores on a standardized test are normally distributed with a mean of 95 and standard deviation of 25. What test score is 0.3 standard deviations below the mean?