The time taken in seconds for Gingers computer to open a specific large document is normally distributed

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The time taken in seconds for Ginger’s computer to open a specific large document is normally distributed with mean 9 and variance 5.91.

a. Find the probability that it takes exactly 5 seconds or more to open the document.

b. Ginger opens the document on her computer on n occasions. The probability that it fails to open in less than exactly 5 seconds on at least one occasion is greater than 0.5. Find the least possible value of n.

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Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook

ISBN: 9781108407304

1st Edition

Authors: Dean Chalmers, Julian Gilbey

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Question Posted: Sep 14, 2021 02:11 AM

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The time taken in seconds for Gingers computer to open a specific large document is normally distributed

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Cambridge International AS & A Level Mathematics Probability & Statistics 1 Coursebook

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