Question

the marks of 18 students in a science unit test were as follows:
10,12,6,2,9,15,18,13,12,13,7,14,19,12,5,7,11,9
calculate: i) the mean ii) the median iii) the mode​

Answer 1

Answer:

Arranging the terms in ascending order:

2,6,8,9,10,11,11,12,13,13,14,14,15,15,15,16,16,18,19,20

Number of terms =20

∑x=2+6+8+9+11+11+12+13+13+14+14+15+15+15+15+16+16+18+19+20=257

(i) Mean =∑x/∑n=257/20=12.85

(ii) Median =(10  

th

 term +11  

th

 term)/2=(13+14)/2=27/2=13.5

(iii) Mode =15 since it has maximum frequencies i.e. 3:

Answer 2

Answer:

i) 10.77

ii) 12,13

iii) 12,7,9

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(I hope this helps!)