Compute the mean and standard deviation of the given sample. mean = standard deviation = (b) Fill in the blank. HINT [See Example 2(b).] Assuming that the distribution of day-by-day changes of the Dow during financial crises is symmetric and bell shaped, then the Dow falls by more than _________ points 16% of the time. What is the percentage of times in the sample that the Dow actually fell by more than that amount?

Compute the mean and standard deviation of the given sample. mean = standard deviation = (b) Fill in the blank. HINT [See Example 2(b).] Assuming that the distribution of day-by-day changes of the Dow during financial crises is symmetric and bell shaped, then the Dow falls by more than _________ points 16% of the time. What is the percentage of times in the sample that the Dow actually fell by more than that amount?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Question

Following is a sample of the day-by-day change, rounded to the nearest 100 points, in the Dow Jones Industrial Average during 10 successive business days around the start of a financial crisis. (Round your answers to the nearest whole number.)

−300, −500, −200, −700, −200, 900, −100, −700, 20, −100

(a)

Compute the mean and standard deviation of the given sample.

mean =

standard deviation =

(b)

Fill in the blank. HINT [See Example 2(b).]

Assuming that the distribution of day-by-day changes of the Dow during financial crises is symmetric and bell shaped, then the Dow falls by more than _________ points 16% of the time.

What is the percentage of times in the sample that the Dow actually fell by more than that amount?

__________ %

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