o 1. The daily milk production of Guernsey cows is approximately normally distri
ID: 3355815 • Letter: O
Question
o 1. The daily milk production of Guernsey cows is approximately normally distributed with a mean of 35 kg/day and a std. deviation of 7 kg/day. The producer is concerned when the milk production of a cow falls below the 10th percentile since the animal may be ill. The 10th percentile (in kg) of the daily milk production is approximately: O A.-1.28 O B. 44.96 O C. 26.03 O D. 48.96 O E. None of the above A public relations officer of William Paterson University wants to estimate the mean IQ of the university students. If she wants to be 99% confident that her sample mean is off by no more than 3 points, how many students she has to test in order to come up with a valid - A. 162 estimation? A recent study shows that IQ of New Jersey students has standard deviation of 15 points. B. 13 D. None of the aboveExplanation / Answer
Mean is 35 and s is 7
for 10%ile, the z value can be found form the normal distribution table as negative of 90% , thus z is -1.28
thus answer is mean+s*z or 35-1.28*7=26.03, thus option C is correct
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