1) A college professor decides to enter grades in terms of standard deviation. The grades are normally distributed with a mean of 80 and a standard deviation of 6. a. What is the probability that a randomly selected student scores a 90 or higher? b. What is the probability that a randomly selected student scores lower than a 70? C. Use the empirical rule to determine the following: if the professor has 60 students, approximately how many of those students should have scored between a 74 and 86? (Give the number of students, not just the percentage).

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.