1. variance of the number of “point down” tosses. 2. A randomly selected sample
ID: 3175208 • Letter: 1
Question
1.
variance of the number of “point down” tosses.
2. A randomly selected sample of 100 horse owners found that 72 of them feed two flakes of grass hay in the morning and one flake of alfalfa plus one flake of grass hay in the evening to their horses while the rest feed two flakes of grass hay in the morning and one flake of alfalfa plus oat hay in the evening. The estimated probability that horse owners feed grass hay in the A.M. and alfalfa plus oat hay in the P.M. is:
0.72.
3.
You toss a thumbtack 100 times and observe that it lands “point down” 65 times. The proportion of times it landed “point down” is then 0.65. This proportion represents the: correlation between “number of tosses” and “number of times it landed point down.” probability that the thumbtack lands “point down.” sample proportion of tosses that landed “point down” in your 100 tosses.variance of the number of “point down” tosses.
2. A randomly selected sample of 100 horse owners found that 72 of them feed two flakes of grass hay in the morning and one flake of alfalfa plus one flake of grass hay in the evening to their horses while the rest feed two flakes of grass hay in the morning and one flake of alfalfa plus oat hay in the evening. The estimated probability that horse owners feed grass hay in the A.M. and alfalfa plus oat hay in the P.M. is:
0.75. 0.28. 0.50.0.72.
3.
About 64% of boys aged 12 to 15 years regularly play video games. If we select a single boy in this age group, the probability that he regularly plays video games is about: 0.83. 17. None of the answer choices is correct. 0.64.Explanation / Answer
1)sample proportion of tosses that landed “point down” in your 100 tosses.
2)=1-0.72=0.28
3)0.64
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