help please

Anonymous
timer Asked: Mar 20th, 2016

Question description

Some students paid a private tutor to help them their results on a certain mathematical test. These students had a mean change in score of +20points, with a standard deviation of 69 points. In a random sample of 100 students who pay a private tutor to help them improve their results, what is the likelihood that change in the sample mean score is less than 10 points?


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