A teacher finds that the test scores of a group of 40 students have a mean of 72 and standard deviation of 8. a. If Henry has a test score of 82, what is Henry's z-score? b. Henry's score is higher than that of 35 of the 40 students who took the test. Find the percentile for Henry's score.

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A: We have given that.   X~N( μ , ?^2 )   μ = , ? =   Z-score =( x - μ )/?

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A: Mean:The formula for finding mean is shown below:

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A: Heh there! Thanks for posting the question. Your question has more than three sub-parts. However, we…

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A: Let Z be the standard normally distributed random variable with mean 0 and standard deviation 1.

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A: It is an important part of statistics. It is widely used.

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A:

Q: Given that the mean of a data set is 20, and the standard deviation of this data se is 8, then what…

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A:

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.