Answer:
66%
Step-by-step explanation: 2/3 is .66666666666666...
2 because the equation can be reduced to: 8.0 x 10^4.
Answer:
3026
30
Step-by-step explanation: Average sum of the female and male's test score is the sum of expected value of each gender:

Assuming x represents the random male selected and y represents the random female selected:

3026
The average sum of their scores is 3026.
Average difference is the difference between the expected value (mean) of each gender:

1528 - 1498
30
The average difference of their scores is 30.