Question

The marks obtained by 10 students in the class test were follows:38,41,36,31,45,38,27,32,29,39
(I) the mean of their marks;
(II) the mean of their marks, when 1 marks is deducted from the marks of each student;
(III) the mean of their marks,when the marks of each student are increased by 2;
(iv the mean of their marks, when the marks of each student are halved.
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Answer 1

Answer:

Step-by-step explanation:

I) 30.7

II) 29.7

III) 32.7

Answer 2

Answer:

Step-by-step explanation:

38+41+36+31+45+38+27+32+29+39=356

Mean:356/10=35.6

Mean minus 1 mark each: 346/10=34.6

Mean plus 2 marks each: 376/10=37.6

Mean when marks are halved: 19+20.5+18+15.5+22.5+19+13.5+16+14.5+19.5

Mean: 178/10=17.8