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?
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1.
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16.58
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2.
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.8416
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3.
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16.68
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4.
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13.32
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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?
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?
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?
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264.078
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135.922
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155.492
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239.543
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