Question

The weight of strawberries follows a normal distribution with a mean weight of 12 grams and a standard deviation of 2.5 grams. If a strawberry is randomly selected, what is the probability that the strawberry weighs less than 9 grams?

Answer 1

A. .2033
B. .1587
C. .0179
D. .1151

Answer 2

you can use a table

Answer 3

first find the z score

Answer 4

what is that?

Answer 5

@perl what is a z score

Answer 6

there are many normal distributions with different means and different standard deviations. so a z distribution allows us to standardize it so that we only have to look at one distribution, and one curves area

Answer 7

ok so what would the z score be in this problem ?

Answer 8

the formula for z score is

z = ( x - mean ) / ( st. dev)

Answer 9

so whats x? 9?

Answer 10

yes :)

Answer 11

i got -1.2 for z score is that correct