In a class of 50 students, the number of students n; of each age i is shown in the following table: Age i ni 18 19 20 22 4 3 21 25 If a student is to be selected at random from the class, what is the expected value of his age?

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Q: The sample mean of a dataset is 3.8 from 13 observations, calculate the sum of observations.

A: From the provided information, Mean of dataset (x̅) = 3.8 Number of observations (n) = 13

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Q: Answer all and explain how it is solved. Show hand written solutions.

A:

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A: B)

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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.