Q1
40+45+45+50+50+60+70+75+95+100=630
Mean=630/10=63
Median=(50+60)/2=55
Scores greater than the median are:60, 70, 75, 95, 100
Scores less than the mean: 60, 50, 50, 45, 45, 40
Only number in both sets is 60
So answer is 1
Help No 3
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Source: Beat The GMAT — Problem Solving |
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Q2
y=(x+a)(x+b)
y=x^2 + ax + bx + ab
(1):a+b=-1
y=x^2 + x(a+b) + ab
y= x^2 +1x + ab
Insuff
(2): Intersects y-axis at (0,-6)
-6=0 + 0 + ab
-6=ab
Insuff
Combined:
y=x^2 + x -6
y has to be 0 for it to intersect the x-axis
0=(x-3)(x+2)
x=-2 | x=3
crosses at the axis at (-2,0) and (3, 0)
so C is the answer
y=(x+a)(x+b)
y=x^2 + ax + bx + ab
(1):a+b=-1
y=x^2 + x(a+b) + ab
y= x^2 +1x + ab
Insuff
(2): Intersects y-axis at (0,-6)
-6=0 + 0 + ab
-6=ab
Insuff
Combined:
y=x^2 + x -6
y has to be 0 for it to intersect the x-axis
0=(x-3)(x+2)
x=-2 | x=3
crosses at the axis at (-2,0) and (3, 0)
so C is the answer
