answer the third part of this question please

Question Four a) A British retailer that specialises in food and clothing announced an end of year revenue of 10billion. The actual revenue is in line with the expected annual revenue. The standard deviation over recent 10 years is 0.38billion. If its revenue follows a normal distribution, calculate the percentage chance that the yearly revenue will be as follows: (1) The retailer's revenue greater than 10.8billion (6 marks) (ii) The company makes a revenue less than 10.5 billion (6 marks) (iii) A forecaster prediction that the revenue will be between 9.8 billion and 10.2 billion (10 marks)