:6. You bet $10 on red in 100 spins of a roulette wheel (see
page ? of the test, and recall that, except for 0 and 00, which
are colored green, the numbers on the roulette wheel alternate
red and black). The total amount you win (or lose) is like a 100
draws from a box containing
a. 1 ticket marked +10 and 1 marked -10

b. 10 tickets marked +1 and 10 marked -1

c. 180 tickets marked -1 and 200 marked +1

d. 200 tickets marked -1 and 180 marked +1

e. 20 tickets marked -10 and 18 marked +10