In the context of provisions for design of mixes and acceptance of concrete in Indian Standards, consider the following statements:
Statement- I: For a M25 grade concrete, if it is expected that the standard deviation in strength will be 4 MPa, the target mean strength for the design of the mix should be taken as 41.5 MPa
Statement- II: The sample of three specimens should be rejected if the difference between the maximum and the minimum strength obtained (from the three specimens) is more than 3.5 MPa.
Which of the following is Correct?1
Both statements are false
2
Statement I is true and Statement II is false
3
Both statements are true
4
Statement I is false and statement II is true