Diketahui :

1.) Diketahui data tunggal : 2, 5, 6, 9, 2, 4, 6, 3, 7, 2, 5, 2

Tentukan :

a. Mean

b. Median

c. Modus

2.) Nilai kuartil 2 dan median berturut-turut dari data berurutan : 3, 3, 3, 4, 4, 6, 6, 6, 9, 9, 10 adalah...

Ditanya :

• Mean ?
• Median ?
• Modus ?
• Kuartil 2

Dijawab :

Data = 2, 5, 6, 9, 2, 4, 6, 3, 7, 2, 5, 2

Nomor 1.

Urutkan terlebih dahulu data² tersebut

2, 2, 2, 2, 3, 4, 5, 5, 6, 6, 7, 9

Median ( Nilai tengah )

= 4 + 5

= 9 : 2

= 4,5

Mean ( Nilai rata - rata )

2 + 2 + 2 + 2 + 3 + 4 + 5 + 5 + 6 + 6 + 7 + 9

2 x 4 = 8

3 x 1 = 3

4 x 1 = 4

5 x 2 = 10

6 x 2 = 12

7 x 1 = 7

9 x 1 = 9

8 + 3 + 4 + 10 + 12 + 7 + 9 = 53

Banyak data = 12

Mean = Jumlah data : Banyak data

Mean = 53 : 12

Mean = 4,41

Modus ( Data yg paling sering muncul )

= 2 ( Sebanyak 4x )

______________________

Nomor 2

3, 3, 3, 4, 4, 6, 6, 6, 9, 9, 10

Banyak data 11

Median ( Nilai tengah )

= 6

Kuartil 2 ( Nilai tengah/Median )

3, 3, 3, 4, 4, 6, 6, 6, 9, 9, 10

= 6

______________________