You have a friend who claims to psychic. you don't believe this so you test your friend by flipping a coin 20 times and having him predict whether each flip is heads of tails. if you are right, and your friend is not psychic, then the probability of guessing correctly on each flip is .5. your friend correctly guesses 15 out of the 20 flips. what is the probability of your friend correctly guessing 15 or more out of 20 flips if he is not really psychic? (give your answer to at least 3 places past the decimal point)

Given that your friend in not really psychic, he has a probability of P=1.5% of guessing right 15 out of 20 coin flips.

Step-by-step explanation:

We have a binomial distribution problem.

We have to calculate the probability of correctly guessing 15 out of 20 flips of a coin (probability of success for every trial: p=0.5).

We can calculate that with the binomial distribution formula:

Then we can conclude that, given that your friend in not really psychic, it has only 1.5% of guessing right 15 out of 20 coin flips.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer

$650 per month plus utilities

step-by-step explanation:

just based on the info you gave, it would seem more cost effective to rent at $650 per month plus utilities.   if utilities are, in fact, $150 per month, your monthly living costs would be $800 as opposed to the other option of $825.