Amanufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4 years, and standard deviation of 2.3 years. if you randomly purchase one item, what is the probability it will last longer than 4 years?

0.9306

Step-by-step explanation:

Given : A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4 years, and standard deviation of 2.3 years.

i.e.

Let x denotes the lifespan of the items.

Then, the probability it will last longer than 4 years will be :-

Hence , our required probability =  0.9306

pooopoopopoopop

step-by-step explanati∵∵∴∴on:

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.