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What is the probability that a randomly chosen student

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Reference no: EM13916983

Question 1 - Track students were timed in the 100 yard dash. It was found that their times were normally distributed with a mean of 15 seconds and a population standard deviation 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 - The number of daily hits on the Excel Power user Workshop website is normally distributed 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 given day?

.4404

.5596

.0668

.9332

Question 3 - It is estimated that the number of text messages sent daily by a high school student is normally distributed with a mean of 200 and a population standard deviation of 50. What is the probability that a randomly chosen student sent less than 210 text messages that day?

.5793

.4207

.8416

.7963

Question 4 - It is estimated that the number of text messages sent daily by a high school student is normally distributed with a mean of 200 and a population standard deviation of 50. The top ten percent send at least how many text messages?

264.078

135.922

155.492

239.543

Reference no: EM13916983

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