I'm really having trouble wrapping my mind around these questions so if you could also explain how you got your answers, that would be fantastic. Thanks.
1) Richie and Garth are electricians. Garth had been on 47% of their company's service calls. At least one of the two workers has been on 73% of their company's. Assume that Garth being on a service call and Richie being on a service call are independent events. What is the probability that Richie will be on the next service call based on the data.
A) 27% B)49% C)75% D)26%
2) There are 147 students. 85 are in P.E., 91 are in the homecoming parade, and 130 are in P.E. and the homecoming parade. What is the probability that a randomly chosen student will be part of the homecoming parade and in P.E.
A) 0.265 B) 0.313 C) 0.048 D) 0.306
3) A school cafeteria serves breakfast 40 high school students and 60 middle school students. Of the 100 students, 50 were biscuits. of the 50 biscuits, 20 were served to high school and 30 were served to middle school. Consider the following events:
B= a biscuit is served.
MS= a middle school student is served
Which statement I'd true about B and MS:
A) Events B and MS are dependent and P(B|MS)=P(MS|B)
B) Events B and MS are independent and P(B|MS)=P(MS|B)
C) Events B and MS are independent and P(B|MS)<P(MS|B)
D) Events B and MS are dependent and P (B|MS)<P (MS|B)
