In the last quarter of 2007, a group of 64 mutual funds had a mean return of 6.9% with a standard deviation of 7.8%. Ifa normal model can be used to model them,what percent of the funds would you expect to be in each region? Use the 68-95-99.7 rule to approximate the probabilities rather than using technology to find thevalues more precisely. Be sure to draw a picture first.a) Returns of -17.5% or lessc) Returns between -9.7% and 21.5%b) Returns of 5.9% or mored) Retums of less than -1.9%PPa) The expected percentage of retums that are -17.5% or less is 0.15 .(Type an integer or acb) The expected percentage of returns that are 5.9% or more is %.(Type an integer or a decimal.)

Answered: Image /qna-images/answer/6fa3d853-79f6-4a27-b28a-c00a51df7dc4.jpg

Answered: In the last quarter of 2007, a group of…

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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Suppose that the lifetime of a particular component of a battery (in a container) is known to be approximately normally distributed with the mean 500 hours and standard deviation 50 hours. A purchaser requires at least 95 percent of them to have a lifetime greater than 399 hours. Will the component of a battery (in a container) meet the purchaser's specification?
Scenario: The mean score for all high school seniors taking a college entrance exam is 500. Advocates for a charter school boast that their program helps to increase student exam scores. For a random sample of 100 students from the charter school, the mean exam score is 516 with a standard deviation of 90. Test the school's claim that their program improves student test scores. Question: Is the charter school correct in their claim? In a short paragraph, formulate the correct conclusions for this test given the results above. In your answer, make sure to address both the null and alternative hypotheses, as well as the charter school's claim.
Suppose that the time required to complete a 1040R tax form is normally distributed with a mean of 110 minutes and a standard deviation of 15 minutes. What proportion of 1040R tax forms will be completed in 0 less than 85 minutes? Round your answer to at least four decimal places,
help me A certain type of automobile battery is known to have a lifespan that is normally distributed, with mean 1100 days and standard deviation 80 days. For how long should these batteries be guaranteed if the manufacturer wants to replace only 5% of the batteries sold because they “died” before the guarantee expired?
Report a 95% confidence interval for the slope coefficient. What is the left limit of the interval? Round to four decimals.
The actual monthly demand of special pizza in the past 6 months were: 449, 352, 413, 348, 290, 352 If a four-month moving average forecasting model is used to generate forecasts, what is the value of the Mean Absolute Percent Error (in percent)? Use at least 4 decimals.
The inflation adjusted annual return of a diversified asset portfolio is assumed to have a normal distribution with a mean of 3.5% and a standard deviation of 1.25%. Represent the value for the inflation adjusted annual return that 95% of outcomes would exceed on a diagram and determine this value.
The average life of a certain type of motor is 7 years, with a standard deviation of 2 years. If the manufacturer is willing to replace less than 3% of the motors because of failures, she should offer a guarantee of ___________ years long.
Suppose that the duration of a particular type of criminal trial is known to be normally distributed with a mean of 24 days and a standard deviation of 6 days. 80% of all trials of this type are completed within how many days?
The time spent (in days) waiting for a heart transplant in two states for patients with type A+ blood can be approximated by a normal distribution, as shown in the graph to the right. Complete parts (a) and (b) below. u= 134 0=18.1 What is the shortest time spent waiting for a heart that would still place a patient in the top 30% of waiting times?
If batteries have lives that are normally distribute with mean 2, 800 hours and standard deviation 400 hours, using the 68-95-99.7 rule to approximate the percentage of batteries having a life less than 3, 600 hours.
A certain brokerage house wants to estimate the mean daily return on a certain stock. A random sample of 20 days yields the following return percentages. 1.09, -1.09, -0.14,-0.03,1.76,-1.59,-1.46 , 2.13, 1.96, 2.01,-0.91,0.64,-2.41, 1.81, –0.25, -0.46,0.37, -0.21, 1.39,0.68 Send data to calculator Send data to Excel If we assume that the returns are normally distributed, find a 95% confidence interval for the mean daily return on this stock. Then find the lower limit and upper limit of the 95% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: Upper limit:

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