Answer:
A = B + 52
Step-by-step explanation:
A is the total amount each week. 52 is the initial amount that she earns each week. Then, B represents the amount of books she sells. So, 15 books can be represented by
A = 15 + 52 = 67
B and C
because the second number is a square of the first number
The mean of 10 randomly selected students is definitely more likely to be closer to 75. 10 randomly selected students to include information and are more like to reflect the class’s scores. Consider an extreme example. Seventy-five students in a class of 100 earned perfect scores. The other 25 earned zeros. The average score of the class would be 75. A sample of 10 random students would almost certainly include more 100s then 0s, but both would be included in the sample. The mean of this samples score is closer to 75 than any individuals.
M=15...................................................................
Answer:
440 students.
Step-by-step explanation:
Given is a table showing the results of a survey.
No of people surveyed = n (say)
No of people who prefer pop music = (5/8) n
(Since given in the table proportion for pop music = 5/8)
But actual studdents who prefer pop music =275
In other words
5n/8 = 275
Cross multiply to solve
5n=2200
divide by 5
n= 440
Thus total people surveyed= 440
Verify:
No of students who prefer Pop music = 440(5/8) = 55(5) = 275
Thus verified
