Answer:
Less than 30: 26
Less than 40: 62
Less than 50: 75
Less than 60: 78
Less than 70: 85
Less than 80: 86
Less than 90: 88
Step-by-step explanation:
We have this frequency information:
20-29: 26
30-39: 36
40-49: 13
50-59: 3
60-69: 7
70-79: 1
80-89: 2
We can add each category and have a cumulative frequency table
<30: 26
<40: 26+36 = 62
<50: 62 +13 = 75
<60: 75 + 3 = 78
<70: 78 + 7 = 85
<80: 85 + 1 = 86
<90: 86 + 2 = 88
Answer: The answer what you seek is D
Using the coordinates of the 2 dots on line E we can calculate the slope.
the 2 dots are located at (2,4) and (6,2)
the slope is the change in Y divided by the change in X
the change in Y = 2-4 = -2
the change in X = 6-2 = 4
the slope = -2/4 which reduces to -1/2
the answer is A.