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Mathematics 7 Online
OpenStudy (anonymous):

Past records show that the times, in seconds, take to run 100m by children at a school can be modelled by a normal distribution witha mean of 16.12 and a standard deviation of 1.60. On sports day the school awards certificates to the fastest 30% of the children in the 100m race. Estimate, to 2d.p., the slowest time taken to run 100m for which a child will be awarded a certificate.

OpenStudy (anonymous):

X~N(16.12, 1.60^2)

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