If one score is randomly selected from a normal distribution with µ = 100 and σ = 20,the probability of obtaining a score less than X = 70 is p = 0.0013.

Question

Quizplus · Accepted Answer

The probability of obtaining a score less than X = 70 in a normal distribution with µ = 100 and σ = 20 is greater than 0.0013. This is because the Z-score for X = 70 would be (70-100)/20 = -1.5, and looking at standard normal distribution tables, the probability associated with a Z-score of -1.5 is approximately 0.0668, not 0.0013.

If One Score Is Randomly Selected from a Normal Distribution