oard n cu edu ebapps assessment ta e launch.sp?course assessment de 32964 18cour
ID: 3057553 • Letter: O
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oard n cu edu ebapps assessment ta e launch.sp?course assessment de 32964 18course id=19426aconter tid. 5955141&step;=null Remaining Time: 11 minutes, 35 seconds. QUESTION 3 2 points Save A survey conducted in 2011 asked employed adults from age 25 to 70 if they plan to keep a foot in the working world after retirement. Thirty-three the respondents answered 'very likely. A random sample of 75 adults from this age group was asked the same question. Using the normal to keep a foot in the working world after 0.1510 0.3821 o 0.4560 O0.6539 QUESTION 4 ording to the MIT Airline Data Project, American Airlines controlled 15.5% of the domestic market in 2010. A random sample of 125 domestic that year was selected. Using the normal approximation to th were on American Airline flights? t e binomial distribution, what is the probability that more than 12 passengers from this sample 0.6368 O0.7995 0.9207 O0.9554 2 points QUESTION 5 During the 3 pm to 5 pm time period, cars arrive at a bank's drive-through window at an average rate of 15 arrivals follows the exponential distribution. What is the probability that a randomly selected customer will arrive more than 10 minutes after the previous 0.0821Explanation / Answer
4)
u = np = 125*0.155 = 19.375 rounding off to 19
variance = npq= 125*0.155*0.845 = 16.372 rounding off to 16
std deviation = sqrt(16) = 4
Z= (x-u)/
= (12-19)/4
= -1.7 (approx)
P(Z>-1.7) = 0.9554
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