Question

1.)The marks obtained by 12 students in a monthly.
test are 11, 19, 7, 13, 18, 21, 9,5
20, 12, 16, 21
a.)Find is the mean of their marks. (b.) find the mean when marks of each student are increased by 3.​

Answer 1

Step-by-step explanation:

mean =11+19+7+13+18+21+9+5+20+12+16+21/12

=149/12

when increased by 3marks

new marks is 14,22,10,16,21,24,12,8,23,15,19,24

mean =14+22+10+16+21+24+12+8+23+15+19+24/12

=220/12

both mean not completely divide so,

Answer 2

Answer:

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Step-by-step explanation:

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