Question 173129
6. The test scores in MRs. Kaste's MAth B class are normally distributed with a mean of 85 and a standard deviation of 5. Between what two scores would 95.4 percent of the scores fall?
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Ans: between 2 standard deviations to the left of the mean and 2 standard
deviations to the right of the mean. 
85-2*5 = 75 ; 85+2*5 = 95
1) 70-100 2) 75-95 3) 80-90 4) 85-90 
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7. The heights of the tides at Jones Beach, NY, are a function of the time of day. THe time from one high tide to another is approximately 12 hours. Which of the following types of functions would best model this situation?
1) exponential 2) linear 3) logarithmic 4) trigonometric 
Ans: trigonometric: the time between the two high tides is the period of
the function.  That period repeats and repeats.
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Cheers,
Stan H.