Determine the probability that both are girls
In second grade class containing 12 girls, and 9 boys, 2 students are chosen at random to give out math papers. Determine the probability that both are girls.
a. (4/7)*(4/7)
b. (4/7)*(11/20)
c. (4/7)*(3/5)
d. (3/7)*(2/5)
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A study that evaluated the effects of reduction in exposure to the traffic-related air pollutants compared respiratory symptoms of 283 residents of area with congested streets with 165 residents in similar area where congestion was removed because
A current poll found that 30% of those surveyed are worried regarding aggressive drivers upon the road. If three people are chosen at random, determine the probability that all three will be worried about aggressive drivers on the road.
Let X as well as U denote random variables, and suppose that E[U|X] = 1 and that E[X] = 2.
At noon Joyce drove to lake at 30 miles per hour, but she made long walk back home at 4 miles per hour. How long she walk if she was gone for 17 hours? How far she walk?
Determine the probability of type II error if the true mean foam height is 200 mm and we suppose that a=0.05? What is the power of test from part b?
Your average rate on return trip is 30 miles per hour faster that the average rate on outgoing trip. If round trip takes two hours, find the average rate on outgoing trip to work?
Two planes leave chicago at 8am, one traveling west at the speed 75 mph faster than other, that is headed east. At 11am, planes are 2,175 miles apart. How fast are planes travelling?
Which of the following isn't the binomial distribution and why? Justify your answer. Tossing a fair quarter 10 times and looking at number of heads that shows up.
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