max and min usage

[#1]

Here is my data and trying to find max/min total cpu usage .  total cpu=Cpu-0+cpu-1+cpu-2+cpu-3

Date	cpu-0	cpu-1	cpu-2	cpu-3
10/1/2014 1:00	12.20	12.30	0.00	0.00
10/1/2014 3:00	10.30	10.30	0.00	0.00
10/1/2014 5:00	16.60	16.40	0.00	0.00
10/1/2014 7:00	23.30	23.30	0.00	0.00
10/1/2014 9:00	24.50	24.50	0.00	0.00
10/1/2014 11:00	26.00	25.90	0.00	0.00
10/1/2014 13:00	26.90	26.40	0.00	0.00
10/1/2014 15:00	28.00	28.10	0.00	0.00
10/1/2014 17:00	27.20	27.10	0.00	0.00
10/1/2014 19:00	25.60	25.50	0.00	0.00
10/1/2014 21:00	23.00	23.00	0.00	0.00
10/1/2014 23:00	16.30	16.20	0.00	0.00
10/2/2014 1:00	10.80	10.80	0.00	0.00
10/2/2014 3:00	9.61	9.16	0.00	0.00
10/2/2014 5:00	16.10	15.90	0.00	0.00
10/2/2014 7:00	22.80	22.80	0.00	0.00
10/2/2014 9:00	24.30	24.10	0.00	0.00
10/2/2014 11:00	25.70	25.90	0.00	0.00
10/2/2014 13:00	26.20	26.40	0.00	0.00
10/2/2014 15:00	27.80	27.80	0.00	0.00
10/2/2014 17:00	27.40	27.40	0.00	0.00
10/2/2014 19:00	25.70	26.00	0.00	0.00
10/2/2014 21:00	23.10	22.90	0.00	0.00
10/2/2014 23:00	17.00	16.90	0.00	0.00
10/3/2014 1:00	11.00	11.20	0.00	0.00
10/3/2014 3:00	9.42	9.33	0.00	0.00
10/3/2014 5:00	15.10	14.80	0.00	0.00
10/3/2014 7:00	21.80	21.60	0.00	0.00
10/3/2014 9:00	23.50	23.00	0.00	0.00
10/3/2014 11:00	24.70	24.30	0.00	0.00
10/3/2014 13:00	25.30	25.10	0.00	0.00
10/3/2014 15:00	26.60	26.10	0.00	0.00
10/3/2014 17:00	25.90	25.80	0.00	0.00
10/3/2014 19:00	24.60	24.30	0.00	0.00
10/3/2014 21:00	23.00	22.90	0.00	0.00
10/3/2014 23:00	17.50	17.50	0.00	0.00

[maxgro · Accepted solution]

in a textbox?

=max(aggr(rangesum([cpu-0],[cpu-1],[cpu-2],[cpu-3]),Date))

in chart ?

=rank(rangesum([cpu-0],[cpu-1],[cpu-2],[cpu-3]))