Thread: Can't remember how to calculate this: P(X< = 54) with mean 63.5 and s.dev. 12.2;

assume distributed

assume distributed normally.


and what about P(X>=54)?


Thanks in advance.

Just use

the answer i obtain from that is my final answer, correct?

You will have to look up the probability in the z-table which corresponds to the z-score you find from the formula.