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4. Assume that the life of laptop brand X is normally distributed. It was found that the average life of laptop brand X is 5 years with a standard deviation of 2 years. A laptop is randomly selected. Find the probability that the life of the laptop is less than 3 years. A. 0.1578 OB. 0.1587

4. Assume that the life of laptop brand X is normally distributed. It was found that the average life of laptop brand X is 5 years with a standard deviation of 2 years. A laptop is randomly selected. Find the probability that the life of the laptop is less than 3 years. A. 0.1578 OB. 0.1587

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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4. Assume that the life of laptop brand X is normally distributed. It was found that the average life of laptop brand X is 5 years with a standard deviation of 2 years. A laptop is randomly selected. Find the probability that the life of the laptop is less than 3 years. O A. 0.1578 B. 0.1587 C. 0.8413 OD. 0.8431 5. The number of viruses found in 0.001 ml of chemical liquid in a test tube follows a Poisson Distribution with a mean 20. Find the probability that there will be at least 30 viruses found in a 0.001 ml of chemical liquid in a test tube. O A. 0.978 B. 0.987 C. 0.022 O D. 0.013
Transcribed Image Text:4. Assume that the life of laptop brand X is normally distributed. It was found that the average life of laptop brand X is 5 years with a standard deviation of 2 years. A laptop is randomly selected. Find the probability that the life of the laptop is less than 3 years. O A. 0.1578 B. 0.1587 C. 0.8413 OD. 0.8431 5. The number of viruses found in 0.001 ml of chemical liquid in a test tube follows a Poisson Distribution with a mean 20. Find the probability that there will be at least 30 viruses found in a 0.001 ml of chemical liquid in a test tube. O A. 0.978 B. 0.987 C. 0.022 O D. 0.013
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