Answer to Question #320401 in Statistics and Probability for eris

Question

The average number of calories in a 1.8-ounce chocolate bar is 230. Suppose

that the distribution of calories is approximately normal with a standard

deviation of 10. Find the probability that a randomly selected chocolate bar will

have less than 200 calories.

Answer 1

$P(X<200)=P(Z<\frac{200-230}{10})$

$=P(Z<-3)$

From the normal tables

$=0.0013$