Statistical based quality control for concrete is carried out for a highway project in which 37 concrete samples were tested randomly. The average strength was found to be 40 MPa with a square of deviation of 400 MPa². What is the standard deviation of the test samples?

The minimum density (g/cc) of corrugated and semi-corrugated asbestos cement sheets considered acceptable for construction purposes by the Indian standard is:

The actual discharge of liquid through an orifice is determined by multiplying ideal discharge by a factor called coefficient of discharge. The coefficient of discharge is given by __________.