Probability and Statistics Basic Probability and Statistics Math Forum

 November 4th, 2015, 10:39 PM #1 Newbie   Joined: Nov 2015 From: NZ Posts: 1 Thanks: 0 Can't seem to find z score or sd- please help :( Hey guys i have the following question which i am really stuck on and i cant seem to find a way to find the z score or the standard deviation. frankly, im not really sure how to approach the question. Help would be greatly appreciated thanks in advance
 November 5th, 2015, 04:38 AM #2 Math Team   Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 You are told that C can be "modeled by a normal distribution, with mean 1496" but are not told the standard deviation. You are told that "Player C is expected to burn more than 1500 calories in 28% of training games". That is 1500- 1496= 4 calories above the mean. Look up the z- score such that z> 4 has probability 0.28 (that is the same as "z< 4 has probability 1- .28= 0.72") in a table of the standard normal distribution. Since the standard normal distribution has standard deviation 1, the standard deviation for this statistic is give by $\displaystyle \frac{4}{\sigma}= z$ or $\displaystyle \sigma= \frac{4}{z}$.

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