A random sample of students were asked which award they would most like to win (Olympic Gold, Academy Award, or Nobel Prize), an
d asked which portion of the SAT they performed better on, between the Math and the Verbal. The results are summarized in the table below. Use this table to answer the following question. 1. If P(M) is the proportion of students who did better on the Math portion of the SAT who prefer winning an Olympic Gold, and P(V) is the proportion of students who did better on the Verbal portion of the SAT who prefer winning an Olympic Gold. What is the standard error of the distribution of the difference of proportions?
After the 3rd pick we have: 4 white, 3 red and 8 black marbles. The probability that the 4th marble is black is: P ( Black ) = 8 / 15 = 0.5333 After the 4th pick we have: 4 white, 3 red and 7 black marbles. P ( Red or Black ) = 10 / 14 = 5 / 7 = 0.7143
Because it goes up by five for they gave us the amount of point they get for 5 hours and the amount of point he had for 5 hours was 50 so we just needed to add 5 more and 50+5= 55
I don't know if I made myself clear but good luck! :)