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Author Question: Solve the problem. Round the standard score to the nearest tenth before using the z-score tables. ... (Read 62 times)

Destiiny22

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on: Jan 18, 2020

Question 1

Solve the problem. Round the standard score to the nearest tenth before using the z-score tables. Express your answer as a percent rounded to hundredths of a percent.

A final exam in Math 160 has a mean of 73 with standard deviation 7.73.  Assume that a random sample of 24 students is selected and the test score of the sample is computed.  Assuming the scores are normally distributed, what percentage of sample means are less than 76?
◦ 97.13%
◦ 66%
◦ 2.87%
◦ 34%

Question 2

Solve the problem. Round the standard score to the nearest tenth before using the z-score tables. Express your answer as a percent rounded to hundredths of a percent.

A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet Cavalier shows that the mean is 8.4 hours and the standard deviation is 1.77 hours.  Assume that a random sample of 40 mechanics is selected and the mean rebuild time of the sample is computed.  Assuming the rebuilding times are normally distributed, what percentage of sample means are greater than 8.0 hours?
◦ 5.48%
◦ 8.08%
◦ 91.92%
◦ 94.52%
Statistical Reasoning for Everyday Life ¦ Bennett, Briggs, Triola ¦ 5th Edition
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Marked as best answer by Destiiny22 on Jan 18, 2020

vkodali

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Reply #1 on: Jan 18, 2020
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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Destiiny22

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Reply 2 on: Jan 18, 2020
Great answer, keep it coming :)

upturnedfurball

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Reply 3 on: Yesterday
Wow, this really help

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