5 The time in hours that Davin plays on his games machine each day is normally distributed with mean 3.5 and standard deviation 0.9.
- Find the probability that on a randomly chosen day Davin plays on his games machine for more than 4.2 hours.
- On 90\% of days Davin plays on his games machine for more than \(t\) hours. Find the value of \(t\).
- Calculate an estimate for the number of days in a year ( 365 days) on which Davin plays on his games machine for between 2.8 and 4.2 hours.