Fluorescent lighbulbs have lifetimes that are normally distributed with a mean of 6.9years and a standard deviation of 1 years. The figure below shows the distribution oflifetimes of fluorescent lightbulbs. Calculate the shaded area under the curve.Express your answer in decimal form accurate to at least two decimal places.Answer:4.96.23Lifetines of Fluorescent Lightbulbs

According to the given information, we have Mean = 6.9 Standard deviation = 1

Answered: Fluorescent lighbulbs have lifetimes…

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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ion on 10.22. The mean and standard deviation of a set of 100 observations were worked out as 40 and 5 respectively by a com- puter who by mistake took the value 50 in place of 40 for one obser- vation. Recalculate the correct mean and variance.
A race director is preparing for an upcoming marathon and estimates that the mean time to finish is 308 minutes. Assume that the times are normally distributed, with a standard deviation of 54 minutes. Use this table or the ALEKS calculator to find the percentage of times that are shorter than 281 minutes. For your intermediate computations, use four or more decimal places. Give your final answer to two decimal places (for example 98.23%). X
00 HI T R of of It takes an average of 13.2 minutes for blood to begin clotting after an injury. An EMT wants to see if the average will change if the patient is immediately told the truth about the injury. The EMT randomly selected 70 injured patients to immediately tell the truth about the injury and noticed that they averaged 13.4 minutes for their blood to begin clotting after their injury. Their standard deviation was 3.52 minutes. What can be concluded at the the a = 0.10 level of significance? %3D a. For this study, we should use Select an answer b. The null and alternative hypotheses would be: Select an answer O Select an answer C. The test statistic ? 0 is 0.475. Enter it here (please show your answer to 3 decimal places.) d. The p-value is 0.6360211626. Enter it here (Please show your answer to 4 decimal places.) e. The p-value is ? a f. Based on this, we should Select an answer the null hypothesis. g. Thus, the final conclusion is that O The data suggest the population mean…
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Assume that adults have IQ scores that are normally distributed with a mean of u= 105 and a standard deviation o = 20. Find the probability that a randomly selected adult has an IQ between 91 and 119. 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 between 91 and 119 is (Type an integer or decimal rounded to four decimal places as needed.)
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Assume that adults have IQ scores that are normally distributed with a mean of u= 105 and a standard deviation o = 15. Find the probability that a randomly selected adult has an IQ between 91 and 119. Click to view page 1 of the table. Click to view page 2 of the table. ces The probability that a randomly selected adult has an IQ between 91 and 119 is (Type an integer or decimal rounded to four decimal places as needed.) Exp The use
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.)
A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1026 h with a standard deviation of 86 h.Find the z-score for lightbulbs which last 910 h. (Round your answer to two decimal places.) 910 h: z =
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find the standard deviation

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