The time to complete a standardized exam is approximately normal with a mean of 70 minutes & a standard deviation of 10 minutes. using the 68-95-99.7 rule, if students are given 90 minutes to complete the exam, what percentage of students will not finish? . a. 32%. b. 5%. c. 2.5%. d. 0.0015%. show step-by-step solution.

Option C) 2.5%

Step-by-step explanation:

We are given the following information in the question:

The distribution of time to complete a standardized exam is approximately normal.

The students are given 90 minutes to complete the exam.

Around 95% of the students will fall in this interval .

Around 5% will not fall into this interval.

Thus, around 2.5% of the students will not be able to complete their test in 90 minutes.

We considered 2.5% only because the remaining 5% of students would lie on both sides of the mean. Our requirement was only to calculate students who would not be able to complete test even in 9- minutes so we divided this percentage by 2.

no one knows lol

step-by-step explanation: