There are 10 boys and 20 girls in a class The class has a test The mean mark for all the class is 60 The mean mark for the girls is 54 Total mark for whole class is 30 60= 1800total mark for girls is 20 54= 1080 therefore subtract smaller from larger to get total mark for boys, and divide that number by 10 to yield 72. The boys mean mark is 72.explanation:start by writing down all the information given in the question
(number of boys = 10, number of girls = 20, girls mean = 54, class mean = 60)then have a think about anything else you might know that isn't explicitly stated (mean = sum of all marks/total number of marks)then create equations for the. Work out the mean mark for the boys Find the total number of people in the class 10+20=30find the total number of marks achieved by the class 60x30=1800since the mean mark for the girls is 54, you c. 10 girls and 15 boys sit a test The mean mark for the boys is 70
Work out the mean mark for the whole class Boys' total = 70 x 15 = 1050 girls' total = 82 x 10 = 820 total = 1870 mean = 1870/ 25 = 74.3 sc answered by sharon c • maths tutor 9764 views see similar maths gcse tutors 10 x 77 = 770girls 20 x 80 = 1600total of boys and girls 770 + 1600 = 23702) divide the sum of the individual scores by the total number of students in the class.sum of individual scores = 2370total number of students
10 + 20 = 302370/30 = 79the mean of the whole class is 79. Class 10 r sat a test The mean mark for the class was 70% There are 30 students is class 10 r, 20 whom are boys The mean mark for the boys in the test was 62% Work out the mean mark for the girls
The mean mark for all the class is 60 the mean mark for the girls is 56
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