Home / Questions / Use the normal distribution to approximate the desired probability. A coin is tossed 20 ti
Use the normal distribution to approximate the desired probability. A coin is tossed 20 times. A person, who claims to have extrasensory perception, is asked to predict the outcome of each flip in advance. She predicts correctly on 14 tosses.
What is the probability of being correct 14 or more times by guessing? Does this probability seem to verify her claim? .4418 , yes .4418 , no .0582 , yes .0582 , no
Question 2 1 points Save Use the normal distribution to approximate the desired probability. A coin is tossed 20 times. A person, who claims to have extrasensory perception, is asked to predict the outcome of each flip in advance. She predicts correctly on 16 tosses. What is the probability of being correct 16 or more times by guessing?
Does this probability seem to verify her claim? .0069 , no .4931 , yes .4931 , no .0069 , yes Question 3 1 points Save Use the normal distribution to approximate the desired probability. Find the probability that in 200 tosses of a fair die, we will obtain at least 40 fives. .1210 .3871 .0871 .2229 Question 4 1 points Save Use the normal distribution to approximate the desired probability. F
ind the probability that in 200 tosses of a fair die, we will obtain at least 30 fives. .6229 .8871 .7673 .5871 Question 5 1 points Save Use the normal distribution to approximate the desired probability.
Find the probability that in 200 tosses of a fair die, we will obtain at most 30 fives. .3229 .1871 .4936 .2946 Question 6 1 points Save Use the normal distribution to approximate the desired probability. Merta reports that 74% of its trains are on time. A
check of 60 randomly selected trains shows that 38 of them arrived on time. Find the probability that among the 60 trains, 38 or fewer arrive on time. Based on the result, does it seem plausible that the "on-time" rate of 74% could be correct? .0409 , no .0316 , no .0316 , yes .0409 , yes
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