A special composite material is to be used for the shell of a tank. Based on a sample size of 49 being tested to determine its ultimate strength, the sample mean is computed to be 900 MPa and sample variance of 4900 (MPa)2. (a) Calculate the parameters of the distribution and the probability that the shell strength of a particular tank is less than 879 MPa, assuming that the strength is (i) normal distributed, and (ii) lognormal distributed. (b) MINDEF bought 5 such tanks. What is the probability that at most 2 tanks have shell strength less than 879 MPa, and the strength is normal distributed