An american roulette wheel has 38 slots numbered 0, 00, and 1 to 36. the ball is equally likely to come to rest in any of these slots when the wheel is spun. the slot numbers are laid out on a board on which gamblers place their bets. one column of numbers on the board contains multiples of 3 - that is, 3, 6, 9, 36. joe places a $1 "column bet" that pays out $3 if any of these numbers comes up.

what are the mean and standard deviation for this model?

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step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15