1) Find the probability that a student uses a lab computer between 5 and 7 hours per week. Give your answer as a percent rounded to the nearest

Tenth. Hint: you'll want to use 5 as your min and 7 as your max.

2) Find the probability that a student uses a lab computer more than 8 hours per week. Give your answer as a percent rounded to the nearest tenth.

Hint: more than 8 simply means we have no max; we want

Everything above 8. Again, we use a really big number to approximate infinity. Min: 8 ; Max: 99999. Interesting note: if you did 1- normalcdf(-99999,8,5.9,1.3), you'll get the same answer by virtue of the complement rule. Try it both ways to make sure that you're right. It makes sense if you think about it. If the probability of more than 9 is 25%, hypothetically, it stands to reason that the probability of less than 9 would be 75%.

3) Tell me what min and max you would use in the normalcdf function if you were trying to find the probability that a student uses a lab computer less than 6 hours per week. Conceptual note: this value should be greater than 0.5.

The mean (5.9 in this case) is right in the middle of the bell curve. So the area is 0.5 to the left and 0.5 to right of it. Since 6 is greater than 5.9, the area to the left of 6 would include the entire left half plus a little more.

4) Tell me what min and max you would use in the normalcdf function if you were trying to find the probability that a student uses a lab computer more than 5 hours per week. Conceptual note: this probability should be a larger than your probability from part 3. If you picture the bell curve with 5.9 right in the middle, then the area to the right of 5 is going to be bigger than the area to the left of 6.

5) Tell me what min and max you would use in the normalcdf function if

you were trying to find the probability that a student uses between 3 and 5

hours per week.

6) What height represents the 99th percentile? Round to the nearest hundredth.