1. The average time a person spends in a library is 30 minutes. The standard deviation is 6 minutes. If a visitor is selected at random. Assume the variable to be normally distributed. a. What is the probability that he/she spends between 25 and 35 minutes? b. What is the probability that he/she spends at most 40 minutes? c. What is the probability that he/she spends at least 35 minutes? 2. Suppose the scores in Statistics exam are normally distributed. If the exam has a mean score of 25 and a standard deviation of 5, what is the probability that if you take the exam you will get a score higher than 32 points?

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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.