MEDAL AND FAN

The length of time before a type of electric generator breaks down is normally distributed with a mean of 71 months and a standard deviation of 2.5 months. What percent of the generators will break down before 66 months?

16%

2.5%

34%

5%

Question

MEDAL AND FAN

The length of time before a type of electric generator breaks down is normally distributed with a mean of 71 months and a standard deviation of 2.5 months. What percent of the generators will break down before 66 months?

16%

2.5%

34%

5%

518nad · Answer

how many std away* is 66 months

kearsten · Answer

5

518nad · Answer

its 5 months away but 1 std is 2.5 months

kearsten · Answer

okay so 2

518nad · Answer

yup

518nad · Answer

so now u go look at your area under the graph, look up table fot this z score of 2

kearsten · Answer

what? sry math is super confusing

518nad · Answer

kay do u hae a zscore table to look at, at the end of ur textbook

kearsten · Answer

no

518nad · Answer

it looks something like this |dw:1477253032150:dw|