1 scores on a certain standardized test are normally, Ask an Expert

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1. Scores on a certain standardized test are normally distributed with mean 509 and standard deviation 112.

A- write down the distribution of Xbar = the mean score of a SRS of 40 test takers

B- What is the probability a SRS of 40 test takers will have a mean score above 555?

C- If there is a probabily of 0.80 that a SRS of 40 test takers will have a score less than a certain number what is the score?

2. If the length of newborns are normally distributed with mean 50cm and standard deviation 5cm:

A- write down the distribution of xbar= the mean of a SRS of 8 newborns

B- what is the probability a SRS of 8 newborns will have a mean length between 48 cm and 51 cm

C- if there is a probability of 0.33 that the mean length of a SRS of 8 newborns is greater than 50 cm but less than a certain amount, what is that amount?

3. The distribution of X is X~Bin (9,1/3). Find the mean and standard deviation of x

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91111444

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