Baking times at the cookie baking competition are normally distributed, with a mean time of 11 minutes and a standard deviation time of 2 minutes. using the empirical rule, approximately what percent of cookies are finished between 7 and 15 minutes?
a) 32%
b) 68%
c) 95%
d) 99.7%

C)95%

Step-by-step explanation:

According to the oxford math center,

"The Empirical Rule

The Empirical Rule gives us a rule of thumb for approximating the proportion of a Normal distribution that falls within 1, 2, or 3 standard deviations of its mean.

Also called the 68-95-99.7 rule in some texts, for what will soon be obvious reasons, the Empirical Rules states that approximately

68% of a Normal distribution can be found within 1 standard deviation of its mean

95% of a Normal distribution can be found within 2 standard deviations of its mean

99.7% of a Normal distribution can be found within 3 standard deviations of its mean

"

We find that the deviation time is 2 min.

Therefore, we use the information given by the oxford math center and gather that it is C, or, 95 percent.

95%

Step-by-step explanation:

I'm taking the test

the solution is 12x-6y

7! = 7×6×5×4×3×2

3! = 3× 2

as 7! is multiple of 3! because 7! contains 3! that is 3× 2 as factor

so 7! /(3! ) = 7× 6× 5× 4

= 42 × 20

= 840

its b) 840✌✌✌

dhruv⭐