probabilities question, can someone please help me out?? Thanks if anyone can?
1. According to a bank, 93% of loan customers will make their monthly house payment on time. If 15 customers are randomly selected, find the probability that 13 of them paid their monthly house payment on time.
2. On any given day, the probabilities of 0, 1 or 2 people getting the wrong amount of change from a given register is .650, .300 and .050 respectively. Find the mean, variance, and standard deviation for the number of people that get the wrong amount a change on a given day.
3. A medical study shows that people have a mean score of 3.8 with a standard deviation of .95 on a given blood test. If patients with scores above 4.00 are to be given a follow –up test, what percentage of patients will fall into that category?
1. Check this against your book, it’s a guess.
C(15,13) * (.93)^13 * (.07)^2
The exponent for the .93 is because 13 of the people are paying, and the exponent of 2 is the other 2 who are not. C(15, 13) = 15! / (13!2!) = 15*7 = 105
