tugas statistik

Data hasil tes awal siswa kelas VIII 4. SMP Negeri 2 Kampar

No	Hasil tes	Banyak (f 1)	X1	f1.x1	FI
1	60-64	13	62	806	13
2	65-69	-	67	67	13
3	70-74	6	72	432	19
4	75-79	-	77	77	19
5	80-84	3	82	246	22
6	85-89	-	87	87	22
7	90-94	1	92	92	23
		Jumlah=23		∑=1807

1.      Carilah Desil  3, 5, dan 7

2.      Carilah Quartil 1, 2, dan 3

3.      Carilah Presentil 15, 30, dan 45

Jawab:

1.      Mencari Desil

D3=1/10. n+1                          D5=1/10.n+1                           D7=1/10.n+1

     =3/10.23+1                              =5/10.23+1                               =7/10.23+1

     =0,3.24                                    =0,5.24                                     =0,7.24

     =7,2                                         =12                                           =16,8

2.      Mencari Quartil

K1=1/4.n+1                             K2=1/4.n+1                             K3=1/4.n+1

     =1/4.23+1                              =2/4.23+1                                 =3/4.23+1

     =0,25.24                                   =0,5.24                                   =0,75.24

     =6                                              =12                                         =18

3.      Mencari presentil

P15=1/100.n+1                       P30=1/100.n+1                     P45=1/100.n+1

      =15/100.23+1                          =30/100.23+1                        =45/100.23+1

      =0,15.24                                  =0,3.24                                  =0,45.24

      =3,6                                          =7,2                                       =10,8

Mencari modus                                              

Bbmo=64,5                                                    

B1=13                                                            

B2=13                                                            

P=5                                                                 

            Mo=Bbmo+p (b1)    

         b1+b2                                       

                  =64,5+5 (13)  

       13+13

      =64,5+5 (0,5)

      =64,5+2,5

      =67                       

Bb=64,5

           Fme=13

           fme=13

            p=5

           me=Bbme+p (n/2-Fme

               =64,5+5 (23/2-13)

                                    13

               =64,5+5 (12-13)

               =64,5+5 (0,07)

               =64,5+0,35

               =64,85