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Nov 2021 p53 q4
3184
Raj wants to improve his fitness, so every day he goes for a run. The times, in minutes, of his runs have a normal distribution with mean 41.2 and standard deviation 3.6.
On 95% of days, Raj runs for more than t minutes.
Find the value of t.
Solution
Given that the running times are normally distributed with mean \(\mu = 41.2\) and standard deviation \(\sigma = 3.6\), we need to find the value of \(t\) such that 95% of the times are greater than \(t\).
This implies that 5% of the times are less than \(t\). The corresponding z-score for the 5th percentile is \(z = -1.645\).