Colleen exercises at home every day The length of time she does this is normally distributed with mean 12 8 minutes and standard deviation She exercises for more than 15 minutes on 42 days in a year of 365 days a Calculate the value of b On how many days in a year would you expect Colleen to exerci...

a To calculate the value of we can use the following formula x z Where x is the t ...

Colleen exercises at home every day. The length of time she does this is normally distributed with

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Colleen exercises at home every day. The length of time she does this is normally distributed with mean 12.8 minutes and standard deviation σ. She exercises for more than 15 minutes on 42 days in a year of 365 days.

a. Calculate the value of σ.

b. On how many days in a year would you expect Colleen to exercise for less than 10 minutes?

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

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Authors: Dean Chalmers, Julian Gilbey

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Colleen exercises at home every day. The length of time she does this is normally distributed with

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

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