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median (me):
me = data ke- (jumlah data /2 + 1)
= data ke- ((6+8+9+5+7+3+2) /2 +1)
= data ke- (40 /2 + 1)
= data ke-21
= 66-72
dengan asumsi distribusi nilai merata, maka:
x tabel pertama = 52 + … + 58 / 7 = 55
x tabel kedua = 59 + … + 65 /7 = 62
-pakai cara yg sama, cari x tabel ketiga sampai ketujuh
x tabel ketiga = 69
x tabel keempat = 76
x tabel kelima = 83
x tabel keenam = 90
x tabel ketujuh = 97
jumlah data = (55x6) + (62x8) + (69x9) + (76x5) + (83x7) + (90x3) + (97x2)
jumlah data = 330 + 496 + 621 + 380 + 581 + 270 + 194
jumlah data = 2872
banyak data = 6 + 8 +9 + 5 + 7 + 3 + 2
= 40
mean (x):
x = jumlah data / banyak data
x = 2872 /40
x = 71,8