Average (mean) = (sum of all the data) / (# of data)
sum of all the data = (average)(# of data)
Thus for 100 students with an average of 93,
sum of all data = (93)(100) = 9300
and for 300 students with an average of 75,
sum of all data = (75)(300) = 22500
Therefore you would expect the overall average to be
(9300 + 22500) / (100 + 300) = 79.5 %
Now if there are x # of advanced students and y # of regular students, then
x + y = 90 (total # of students) and 93x + 75y = 87(x + y) (overall average)
The second equation can be simplified to x - 2y = 0
Subtracting the two equations yields
x = 60 and y = 90
Therefore you would need 60 advanced and 30 regular students.
Answer:
The determinant of the matrix for the the pineapple cake is 4,350. the price of one pineapple cake is 3,520
The determinant of the matrix for the chocolate cake is 5,075 . the price of the chocolate cake is 4,414
1 yard = 36 inches
2 yards = 72 inches
Solution: 2 yards is more
Answer:
5(8-x)
Step-by-step explanation:
Fact using the GCF (Greatest Common Factor) of 40 and 5
Factors of 5:
1,5
Factors of 40:
1,2,4,5,8,10,20,40
The greatest factor they both have is 5
Factor by distributing out a 5
40-5x
5(8-x)
Answer:
18
Step-by-step explanation:
12×1.5=18
its the same formula with rectangle cz if you combine both right angled triangle side its become a rectangle
