The batteries from a certain manufacturer have a mean lifetime of 820 hours, with a standard deviation of 90 hours. Assuming that the lifetimes are normallydistributed, complete the following statements.(a) Approximately ?1090 hours.of the batteries have lifetimes between 550 hours and(b) Approximately 68% of the batteries have lifetimes between hours andhours.X

Given, Mean , Standard deviation , Using formula, According to empirical rule , 68%,,,95%,,

Answered: The batteries from a certain…

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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Approximate the population mean and standard deviation of age for males. By the way, we are subtractibg vertically to get the midpoints (ex: 0+10/2=5, 10+20/5=15).
Assume that thermometer readings are normally distributed with a mean of 0degrees°C and a standard deviation of 1.00degrees°C. A thermometer is randomly selected and tested. (The given values are in Celsius degrees.) Between -1.47and 1.76
Assume that adults have IQ scores that are normally distributed with a mean of u= 100 and a standard deviation g= 15. Find the probability that a randomly selected adult has an IQ less than 118. Click to view page 1 of the table. Click to view page 2 of the table. The probability that a randomly selected adult has an IQ less than 118 is (Type an integer or decimal rounded to four decimal places as needed.)
An SRS of 25 recent birth records at the local hospital was selected. In the sample, the average birth weight was x = 119.6 ounce Suppose the standard deviation is known to bes = 6.5 ounces. Assume that in the population of all babies born in this hospital, the birth weights follow a Normal distribution, with mean m. Based on the 25 recent birth records, the sampling distribution of the sample mean x can be represented by: a. N(119.6, 1.30). b. N(119.6, 6.5). O c. N(m, 1.30). O d. N(m, 6.5).
The IQ's in a certain population are normally distributed with a mean score of 104 and a standard deviation of 14. If we select a person at random from this population, find the probability that their IQ will be: 1. Find the 67th percentile of IQ's in this population. 2. Find the 20 The percentile of IQ's in this population 3. Find the IQR of IQ's in this population.
What is the population standard deviation using the following formula
Suppose that a category of world class runners are known to run a marathon (26 miles) in an average of 146 minutes with a standard deviation of 13minutes. Consider 49 of the races.Let X = the average of the 49 races. Find the 60th percentile for the average of these 49 marathons. (Round your answer to two decimal places.)min
Suppose that the speeds of cars travelling on California freeways are normally distributed with a mean of 61 miles tickets for cars with speeds exceeding 80 The records show that exactly 1% of the speeds exceed this limit. Find the standard deviation of the speeds of hour cars travelling on California freeways. Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place. miles hour X miles hour 5 . The highway patrol's policy is to issue
The following data are the distances from the workplace (in miles) for the 5 employees of a small business. 14, 3, 8, 13, 2 Assuming that these distances constitute an entire population, find the standard deviation of the population. Round your answer to two decimal places.
Suppose baby kittens' weights are normally distributed with a mean of 11.4 and a standard deviation of 2.1. The Z-score tells you how many units above the average (if Z-score is positive) or below the average (if Z- Score is negative) any particular baby kitten's weight is. Find the baby kitten weight that corresponds to the following Z-scores. Use the formula Z where u is the mean, o is the standard deviation, and X is the baby kitten weight. a. Z = = 0.07, X = b. Z = 1.63, X =

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