Question

Please tell me the answer please please please please please please please

Answer 1

class mark (xi)= 15

17.5

20

22.5

25

27.5

30

32.5

total frequency=157

xifi=600

647.5

640

450

350

247.5

150

32.5

total xifi=3117.5

therefore mean=total xifi/fi

=3117.5/157

=19.85