Question
number 28
25·Gonder or Children A coupir hus 4 childsun. Find each probability a, All girts b. Exaaly two girls and two boys c, At least one child who is a girt d. At least one child of each gender lates at vith the egin with 26. Sources of Energy Uses in the United States A break- down of the sources of energy used in the United States is shown below. Choose one energy sounce at random Find the probability shat it is a. Not oil uped into with each h. Natural gas or oil c. Nuclear Oil 39% Nuclear 8% Natural gas 24% Hydropower 3% Coal 23% Other 3% AB 3% 27. Game of Craps In a game of craps, a player wins on the first roll if the player rolls a sum of 7 or 11. and the player loses if the player rolls a 2. 3, or 12. Find the probability that the game will last only one roll. 28. Computers in Elementary Schools Elementary and secondary schools were classified by the number of computers they had. f all of the nted for nted for ith) ac- bility that her than Computers 1-10 11-20 21-50 51-100 100+ Schools 3170 4590 16,741 23,753 34.803 Choose one school at random. Find the probability that it has a. 50 or fewer computers b. More than 100 computers c. No more than 20 computers Source. Worl Ahmmr. 29. College Debt The following information shows the 29 31 73 79 amount of debt students who graduated from college incur for a specific year S1 to$5001 to $20,001 to $5000 $20,000 $50,000 $50,000+ 27% If a person who graduates has some debt, find the 19% 14% 40%
Explanation / Answer
Question 28:
Total schools = 3170 + 4590 + 16741 + 23753 + 34803 = 83057
a) Probability that it has 50 or fewer computers is computed as:
= Number of schools with 50 or fewer computers / Total schools
= ( 3170 + 4590 + 16741 ) / 83057
= 0.2950
Therefore 0.2950 is the required probability here.
b) Probability that it has more than 100 computers is computed as:
= 34803 / 83057
= 0.4190
Therefore 0.4190 is the required probability here.
c) Probability that it has no more than 20 computers is computed as:
= (3170 + 4590 ) / 83057
= 0.0934
Therefore 0.0934 is the required probability here.
