The marks obtained by 8 students in a competitive exam are 123, 134, 145, 156, 177, 156, 155, 144. Find:
i) the mean of the marks scored.
ii) the new mean if each student's marks are increased by 5.
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Answer:
The marks of 15 students is
41,39,48,52,46,62,54,40,96,52,98,40,42,52,60
Mean =
15
41+39+48+52+46+62+54+40+96+52+98+40+42+52+60
=
15
822
=54.8;
Number of observations =15 (odd)
Median score =8th number arranging in ascending order which is 52.
Maximum frequency =3 of 52
∴ Mode =52..
Step-by-step explanation:
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