At one high school, students can run the 100-yard dash in a mean of 15.2 seconds with a standard deviation of 0.9 seconds. The times are very closely approximated by a normal curve. Rounding to the nearest tenth of a percent as necessary, find the percent of times that are:Between 14.3 and 16.1 seconds
A. 47.5%
B. 68%
C. 50%
D. 34%
Answer: B
Mathematics
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A. True B. False
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Find the probability.A multiple choice test has 30 questions. Each question has five possible answers, of which one is correct. If a student guesses on every question, find the probability of getting exactly 12 correct.
A. 0.0806 B. 0.4000 C. 0.0052 D. 0.0064
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Estimate the answer by rounding as indicated.Estimate by rounding to the leftmost digit.31,698 ÷ 484
A. 600 B. 50 C. 60 D. 500
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Multiply or divide as indicated. Make sure that your answer is reasonable by estimating first. 139.6 × 0.56
A. 78.287 B. 78.176 C. 78.286 D. 78.276
Mathematics