In concrete mix design the largest mean compressive strength (f'ck) of concrete is given by-
f'ck = fck + 1.65 s
As per IS 10262:2019, what is the assumed value of standard deviation (S) for M65 grade of concrete for concrete mix design? (fck = required characteristic compressive strength of concrete at 28 days, in N/mm2.)
1
5
2
3.5
3
4
4
6