Question

b) The marks of 20 students in test are given below
mean
2,6,8,9,10,11,11,12,13,13,14,14,15,15,15,16,16,18,19,20. Calculate (i)mean
(ii) median (iii) mode.​

Answer 1

Step-by-step explanation:

❤ MEAN :-

• Mean = $\frac{ Sum \: of \: observation }{ No. \: of \: observation }$
• Mean = $\frac{ 2 + 6 + 8 + 9 + 10 + 11 + 11 + 12 + 13 + 13 + 14 + 14 + 15 + 15 + 15 + 16 + 16 + 18 + 19 + 20 }{ 20 }$
• Mean = $\frac{ 257 }{ 20 }$

❤ Mean = 12.85

⭐ MEDIAN :-

• Median :- Exactly the middle value
• Median = $\frac{ 13 \: + \: 14 }{ 2 }$
• Median = $\frac{ 27 }{ 2 }$

⭐ Median = 13.5

______OR_______

⭐ Median = 13

☄ MODE :-

• Mode :- Most repeated number

☄ Mode = 15