If the mean score is 55% and the s.d. is 15%, then a test score of at least
55% + 1.5 × 15% = 77.5%
falls in the A range.
The next cutoff score is 0.5 s.d. from the mean, which is
55% + 0.5 × 15% = 62.5%
so any test score between 62.5% and 77.5% is in the B range.
The next cutoff is
55% - 0.5 × 15% = 47.5%
so a score between 47.5% and 62.5% gets a C.
The lower limit of the next range is
55% - 1.5 × 15% = 32.5%
so 32.5% - 47.5% gets a D.
Anything lower than 32.5% is an F.
Answer:
47%
Step-by-step explanation:
893/1900=x/100 x=47%
Answer:
4y( 4xy + 7x +2)
Step-by-step explanation:
16xy^2+28xy+8y
16xy^2 =2*2*2*2*x*y*y
28xy = 2*2*7 *x*y
8y = 2*2*2*y
The common factors are 2*2*y = 4y
2*2*2*2*x*y*y + 2*2*7 *x*y+2*2*2*y
2*2*y( 2*2*x*y + 7 *x+2)
4y( 4xy + 7x +2)
Answer:
x and y = 0
the question looks weird and almost wrong because when you subtract the equations, you are left with nothing
Step-by-step explanation:
Multiply the top equation by 3 to make the -x a -3x instead.
Then do the top equation - the bottom equation
At this point you should be left with x
