Use z-scores:
z = (x - mean)/sd
Your data:
x = 110, 50
mean = 100
sd = 20
Calculate both z-scores. Use a z-table to determine probability for each score.
I hope this will help get you started.
For a normal population with µ = 100 and σ = 20:
1. What is the probability of a particular score being greater than 110?
2. What is the probability of a particular score being less than 50?
1 answer