www-awa.aleks.com s Tim ????? ???????. Learn - ??????? Assignments A ????? ???????. Assignments A K Random Variables and Distributions 1/5 Introduction to expectation Español Justin is in charge of planning a reception for 2800 people. He is trying to decide which snacks to buy. He has asked a random sample of people who are coming to the reception what their favorite snack is. Here are the results. \begin{tabular}{|c|c|} \hline \begin{tabular}{c} Favorite \\ Snack \end{tabular} & \begin{tabular}{c} Number of \\ People \end{tabular} \\ \hline Cake & 26 \\ \hline Pretzels & 24 \\ \hline Cookies & 47 \\ \hline Other & 63 \\ \hline \end{tabular} Based on the above sample, predict the number of the people at the reception whose favorite snack will be pretzels or cake. Round your answer to the nearest whole number. Do not round any intermediate calculations. \( \square \) \( \square \) people \( \square \) x \( \square \) \( \square \) Explanation Check
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Total sample size = 26 (Cake) + 24 (Pretzels) + 47 (Cookies) + 63 (Other) = 160 Show more…
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Problem 4 A school newspaper reporter decides to randomly survey 13 students to see if they will attend Tet festivities this year. Based on past years, she knows that 50% of students attend Tet festivities. We are interested in the number of students who will attend the festivities. Where applicable, your entries must be either fractions in "p/q" format, or decimal values accurate to nearest 0.01 . a. (15%) If X denotes the random variable we wish to measure, then X is the number of students b. (15%) X takes on integer values from to . c. (15%) X is a random variable that follows a distribution. d. (15%) How many of the N students do we expect to attend the festivities? E[X] = e. (20%) Find the probability that at most 3 students will attend. P(X ≤ 3) = f. (20%) Find the probability that more than 4 students will attend. P(X > 4) =
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