3 Pia runs 2 km every day and her times in minutes are normally distributed with mean 10.1 and standard deviation 1.3.
- Find the probability that on a randomly chosen day Pia takes longer than 11.3 minutes to run 2 km .
- On \(75 \%\) of days, Pia takes longer than \(t\) minutes to run 2 km . Find the value of \(t\).
- On how many days in a period of 90 days would you expect Pia to take between 8.9 and 11.3 minutes to run 2 km ?