Study shows that teenagers spend on average $ 55.5 per month on fast food. with a standard deviation of $4.5. If their monthly spendings are approximately normally distributed, determine: The probability that their monthly spending is between $56.5 and $58.5The spending that separates the top 30% of the spending from the bottom of the 70% of the spending. Round answer to one decimal place.If 36 teenagers are randomly selected, what is the probability that the mean of their monthly spending is greater than $57.5?

Solution-: Given: \mu=55.5, \sigma=4.5 We find, (a) P(their monthly spending is between $56.5 and…

Answered: Study shows that teenagers spend on…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Study shows that teenagers spend on average $ 55.5 per month on fast food. with a standard deviation of $4.5. If their monthly spendings are approximately normally distributed, determine:

The probability that their monthly spending is between $56.5 and $58.5

The spending that separates the top 30% of the spending from the bottom of the 70% of the spending. Round answer to one decimal place.

If 36 teenagers are randomly selected, what is the probability that the mean of their monthly spending is greater than $57.5?

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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