S3 MS Jan 2006

Page 1

January 2006

6685 Statistics S3 Mark Scheme

Question Number

Scheme

Marks

1.

B1

Total in School = (15  30) + 150 = 600 random sample of

30  40 600

(Use of

= 2 from each of the 15 classes random sample of

150  40 600

40 ) their 600

M1 A1

Either A1

= 10 from sixth form; Label the boys in each class from 1 – 15 and the girls from 1 – 15. use random numbers to select 1 girl and 1 boy

B1 B1

Label the boys in the sixth form from 1 – 75 and the girls from 1 – 75. use random numbers to select 5 different boys and 5 different girls.

B1 (7)

1


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