If a distribution is normal with μ = 50 and σ = 10, then what proportion of the scores will fall between 30 and 70?
A).9544
B).3413
C).6826
D).9974

Question

Quizplus · Accepted Answer

A normal distribution with μ = 50 and σ = 10 implies that scores between 30 and 70 are within ±2 standard deviations from the mean. According to the empirical rule (68-95-99.7 rule), approximately 95.44% of the scores fall within ±2 standard deviations from the mean.

If a Distribution Is Normal with μ = 50 and σ