Stats_Quiz_dpqr

$P(Y>15)$

> 1-pnorm(15,20,10)
[1] 0.6914625

$P(Y=20)$

P(Y = a) = 0

$P(21<Y<26)$

> pnorm(26,20,10) - pnorm(21,20 ,10)
[1] 0.185919

$P(Y<11)$

> pnorm(11,20,10)
[1] 0.1840601