The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. Answer the following questions. (a) What is the probability of completing the exam in one hour or less?

0.02275

Step-by-step explanation:

We have been given that the time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. We are asked to find the probability of completing the exam in one hour or less.

We know that 1 hour equals 60 minutes. First of all, we will find the z-score corresponding to 60 minutes.  

z = z-score,

x = Sample score,

= Mean,

= Standard deviation.

Now, we will use normal distribution table to find area under z-score of as:

Therefore, the probability of completing the exam in one hour or less is 0.02275.

answer: 2/4

step-by-step explanation:

step-by-step explanation:

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