On the second test, the class mean was 80 and the mean girl’s scores was 75. What was the mean of the boy’s scores?

need to know the number of boys and girls

Mrs. Gifford's class consists of 15 girls and 25 boys.

On the first test the mean of the girls’ scores was 80 and the mean of the boy’s scores was 70. What was the class mean? (Remember the class mean is not just averaging the two means)

2nd test ... (15 * 75) + (25 b) = 40 * 80

1st test ... (15 * 80) + (25 * 70) = 40 m

whats the answer

To find the mean of the boy's scores, we can use the formula for calculating the mean. The formula for finding the mean, or average, is to sum up all the values and divide by the total number of values.

Let's assume that there are a total of n students in the class, both boys and girls. If the mean of the class is 80, we know that the sum of all the scores must be 80 multiplied by n.

Similarly, if the mean of the girls' scores is 75, we can say that the sum of the girls' scores must be 75 multiplied by the number of girls in the class.

Now, since we don't have the exact numbers for the number of girls or boys, we can assign variables to represent them. Let's say there are g girls and b boys in the class.

The sum of the girls' scores would then be 75 multiplied by g, and the sum of the boys' scores would be the total sum of all the scores (80 multiplied by n) minus the sum of the girls' scores (75 multiplied by g).

Sum of boys' scores = (80 * n) - (75 * g)

Finally, to find the mean of the boys' scores, we divide the sum of the boys' scores by the number of boys (b).

Mean of boys' scores = (Sum of boys' scores) / b

So, with the given information and the formula, we can calculate the mean of the boys' scores. However, we need to know the values of n (total number of students) and g (number of girls) to get the exact result.