Jika setiap data dikali p & kemudian
ditambah q didapat data gres dgn rata-rata 105 & jangkauan 40. Nilai dr 2p– q
–1
Pembahasan:
x̅ permulaan = 50
j permulaan = 20
x̅ baru = 105
j baru = 40
⇒ 20p = 40
p = 2
⇒ 50p + q = 105
50.2 + q = 105
100 + q = 105
q = 105 – 100
q = 5
⇒ 2p – q = 2.2 – 5 = –1