First of all, is 15 the variance or st deviation? I guess its the st deviation since it's not a perfect square.
Next look up the 65 LOWER percentile, z0 of a st normal and solve for x0 ...
I'm currently taking Statistics 1 and I'm stuck on a problem that I've been trying to solve out for a while...hopefully one of you guys can help me out...heres the question:
Find Xₒwhere P(X ≥Xₒ) = 0.65 and X ~ N(200,15)
-From population draw a sample of 36 units. Find P(x-bar ≥ 225)
-Construct a confidence interval at 95% confidence
-Interpret the interval ask that on the physics forum
please show work so i can follow & understand