1someone flips 12 biased coins once the coins are weighted such that the probability of a head
with any coin is 70.
a what is the probability of getting exactly 9 heads?
b what is the probability of getting at least 9 heads?
c. what is the probability of getting 4 tails?
2. at a local race track, each race has 5 horses. assume that the horses are equally matched in
each race such that every horse has an equally likely chance of winning. if you went to this
particular track and bet on 12 races, what is the probability that you would pick the winner in
а 6 races
b. less than 6 races
c. either 3 races or more than 7 races
d between 4 and 8 races (inclusive)
e. at least 3 races
3. a multiple choice exam has 4 answer choices (a, b,c, d). there are 20 questions on the exam.
assuming you guessed on every question what is the probability that you would get:
a. 10 correct
b. at least 5 correct
c. more than 15 correct
d. 12 incorrect

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

(x-5)1/2+5=2 what is possible solution of this equation

Apoll is being conducted at a mall nothingto obtain a sample of the population of an entire country. what is the frame for this type of​ sampling? who would be excluded from the survey and how might this affect the results of the​ survey? what is the frame for this type of​ sampling? a. the frame is people who need new clothes. b. the frame is people who shop at the mall. c. the frame is people who like to shop. d. the frame is the entire population of the country. who would be excluded from the survey and how might this affect the results of the​ survey? a. any person that does not need new clothes is excluded. this could result in sampling bias due to undercoverage. b. any person who does not shop at the mall is excluded. this could result in sampling bias due to undercoverage. c. any person who does not shop at the mall is excluded. this could result in nonresponse bias due to people not participating in the poll. d. there is nobody that is being excluded from the survey.