90 Test scores were normally distributed with a mean of 71 and standard deviation of 8. Fill in the no distribution curve and answer the following questions. a. Find the probability that a test score would be in-between a 63 and 87. b. Approximately how many students scored at least a 79? c. Find the probability of a test score being below a 60. d. Approximately how many students scored above an 85? Activate Win- Go to Settings to e. Approximately how many students scored between a 70 and a 100?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.