(d) KD Tunku Abdul Rahman is Malaysia submarine, which utilized high- strength steel as the main material for its hull. On average, this steel having a yield strength of 80,000 psi with a standard deviation of 12,353 psi and normally distributed. A random sample of 64 KD Tunku Abdul Rahman is observed. i. Find the probability the mean yield strength will be more than 75,000 psi. (5 marks) ii. Find the probability the mean yield strength will be between 77,000 to 83,000 psi. (4 marks) iii. If 18% of the KD Tunku Abdul Rahman in the sample have the mean yield strength less than x, what is the value of x?