That is a perfectly horizontal line, and perfectly horizontal lines are "y=" lines. Which y point does it go through? It goes through at y = 2 and x = 0, so the equation for the line is y = 2, choice A from above.
The sample size is the number of people.
You can get the sample size by counting the completion times for each.
Sample size of men = 19
Sample size of women = 34
The mean time is the average time, so you need to add all the times for the men and divide it by the number of men and then the same for the women:
Mean time for men = 3129 / 19 = 164.68 seconds
Mean time for women = 5834 / 34 = 171.59 seconds.
The mean time taken by men is less than the women.
The rule to use is PEMDAS. (Parenthesis, Exponents, Multiplication, Division, Addition, and Subtraction) When there's a number in front of one parenthesis, you distribute that number to the terms on the inside based on PEMDAS. What should also be notified is the exponent rules for multiplication and division. Then combine like terms. They have to have the same base of multiplying or dividing. Combining like terms need to have the same exponent, or whole numbers in groups.
Move all terms that don't contain K to the right side and solve.
K= Z/3 + 3
Don't you just add, though?
3.8 + 5.25 = 9.05 hours?
