Question 1
Trackstudents were timed in the 100 yard dash. It was found that their times werenormally distributed with a mean of 15 seconds and a population standarddeviation of 2 seconds. Eighty percent of track students can complete the 100yard dash in less than what time?
|
1. |
16.58 |
|
|
2. |
.8416 |
|
|
3. |
16.68 |
|
|
4. |
13.32 |
Question 2
Thenumber of daily hits on the Excel Poweruser Workshop website is normallydistributed with a mean of 100,000 with a population standard deviation of10,000. What is the probability of getting more than 85,000 hits on a givenday?
|
.4404 |
||
|
.5596 |
||
|
.0668 |
||
|
.9332 |
Question 3
Itis estimated that the number of text messages sent daily by a high schoolstudent is normally distributed with a mean of 200 and a population standarddeviation of 50. What is the probability that a randomly chosen student sentless than 210 text messages that day?
|
.5793 |
||
|
.4207 |
||
|
.8416 |
||
|
.7963 |
Question 4
It is estimated that the number of text messages sent daily by ahigh school student is normally distributed with a mean of 200 and a populationstandard deviation of 50. The top ten percent send at least how many textmessages?
|
264.078 |
||
|
135.922 |
||
|
155.492 |
||
|
239.543 |
