Answer
$0.333$
Work Step by Step
$N=90$ because the die is rolled 60 times.
$E$ is the event that the number that comes up is at least 4. (4,5,or 6): 4 come up 30 times, 5 and 6 come up 15 times each.
$fr(E)=30+15+15=60$
$P(E)=\frac{fr(E)}{N}=\frac{60}{90}=\frac{1}{3}\approx 0.333$
