Question

Sammy's Sandwich Shop has a mean delivery time of 25 minutes with a standard deviation of 2 minutes. Determine the z-score for the number of sandwiches delivered in less than 23 minutes. −1 1 11.5 12.5

Answer 1

-1

Explanation:

i got it right

Answer 2

-1

Explanation:

Given: Mean= 25 minutes.

Standard deviation= 2 minutes

x= 23 minutes.

Lets find the z-score for the number of sandwiches delivered in less than 23 mins.

Formula: Z-score=
`(x-mean)/(standard\ deviation)`

Z-score=
`(23-25)/(2)`

⇒ Z-score=
`(-2)/(2)`

∴ Z-score will be -1

Hence, -1 is the z-score for the number of sandwiches delivered in less than 23 minutes.