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)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?
I ONLY NEED THE SECOND TEST MEAN!!!!!
3 answers
IDK but can u help on my questions?
"the class mean was 80" ---> so the total of all the scores
= 80*40 = 3200
"the mean girl’s scores was 75" ----> the total of all the girls' scores
= 15*75 = 1125
which leaves 2075 for the total of the boys' scores.
But there were 25 boys, so the boys' mean = 2075/25 = 83
= 80*40 = 3200
"the mean girl’s scores was 75" ----> the total of all the girls' scores
= 15*75 = 1125
which leaves 2075 for the total of the boys' scores.
But there were 25 boys, so the boys' mean = 2075/25 = 83
thanx :)