请教单边CPK计算

请教以下数据怎么计算单边CPK，最小值为49

55.30 55.10 55.20 55.10 54.80
54.30 54.60 55.70 54.60 56.10
54.80 53.30 55.90 54.60 53.40
55.20 55.70 55.30 55.40 55.60
54.60 55.20 55.30 53.90 54.80
53.80 54.20 54.20 55.70 53.80
53.20 55.80 55.50 54.60 55.50
55.00 55.40 54.20 55.70 54.70
55.20 54.60 55.60 55.20 55.90
54.90 53.70 55.90 55.10 54.60
55.30 54.20 55.70 54.60 56.00
54.30 55.70 56.60 55.00 54.20
54.80 55.50 54.20 53.90 55.50
55.20 54.30 55.50 55.70 54.20
54.60 55.30 54.20 56.10 55.60
53.80 54.30 55.60 54.20 56.00
56.00 55.80 54.60 55.60 55.30
56.30 53.40 55.30 54.80 55.10
55.20 56.10 56.20 55.90 54.80
55.10 54.40 54.70 55.70 53.80
54.60 55.50 55.70 55.20 53.80
53.40 55.80 55.10 56.10 54.20
54.20 55.40 55.60 55.40 56.20
55.20 55.10 54.80 55.80 55.60
55.10 55.50 54.60 55.50 54.60