Chapter 06, Section 6.3, Problem 025b time taken to run a road race. Suppose .x is...

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Answer 1

Answer #1

Here it is given that distribution is normal with mean=190 and standard deviation=21

We need to find P(222 < r< 243)

As distribution is normal we can convert x to z

222-190 243-190 21 ) = P( 1.52 < z < P222 < x < 243) 2.52) = 0.0584 21

Answer 2

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