The ratio of boys to girls in the 9th grade is approximately 7 to 9. There are 228 girls. How many boys are there?
1 answer:
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<u>Answer:</u>
-16 cents
<u>Step-by-step explanation:</u>
We are given that on three rolls of a single die, you will lose $19 if a 3 turns up at least once, and you will win $5 otherwise.
We are to find the expected value of the game.
P (at least one 5 in three rolls) = 1 - P (no. of 3 in three) = = 0.875
P (other results) = 1 - 0.875 = 0.125
Random game value = -19, +5
Probabilities: 0.875, 0.125
Expected game value (X) = 0.875 × (-19) + 0.125 × (5) = -16 cents
Therefore, every time you play the game, you can expect to lose 16 cents
Question 3 ⇒ 6.5 x
If you move the decimal point in 6.5 seven spaces to the right you would get the number 65,000,000.
Question 4 ⇒ 3.99 x
4.4 x = 0.000044
3.99 x = 0.00000399
2.6 x = 260
1.85 x = 1850
Question 5 ⇒ 0.0072
If you move the decimal point of 7.2 three spaces to the left. Your answer would be 0.0072, the third choice.
Question 6 ⇒
To get the answer to this problem you would count how many decimal places it would take to get your decimal point after 1, which would be 7. But, you want your exponent to be to the power of 10 not 1, so you would simply subtract 1 from 7 (7-1) which would give you 6. So your answer is .