Question

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%

Answer 1

Answer:

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.