A data set has a mean of 100 and a standard deviation of 20. What is the approximate probability of picking a data item that is less than 80?

Question

Answer choices:

a) 0.8427

b) 0.1573

c) 0.1359

d) 0.0214

Answer 1

Z= (X- µ)/σ = (80-100)/20 = -1

UES Z-TABLE WE GOT 0.1573 = 15.73%