R could equal any number, but it has to be higher than 4, because 3+4=7.
Answer:
11.8
Step-by-step explanation:
3(12.4) + 6(11.5) = 37.2 + 69 = 106.2
106.2/9 = 11.8
Answer:

Step-by-step explanation:
We have been given that that there are 8 boys from Wilmette, 5 girls from Kenilworth, 9 girls from Wilmette, 5 boys from Glencoe, 5 boys from Kenilworth and 7 girls from Glenoce.
The total number of students from Kenilworth is 5 boys plus 5 girls that is 10 students.
The total number of students in the class would be 





Therefore, the probability, that the student will be from Kenilworth, is approximately 0.256.
Answer: probability = 0.506
Step-by-step explanation:
The data we have is:
Total people: 205 + 160 + 40 = 405
prefer cats: 205
prefer dogs: 160
neither: 40
The probability that a person chosen at random prefers cats is equal to the number of people that prefer cats divided the total number of people:
p = 205/405 = 0.506
in percent form, this is 50.6%
Subtract 8 from both sides and then multiply both sides by -5
V = -5