please help to answer

(b) According to an electric company, the mean electIic consumption for all households in a selected area is 1675 kilowatt/hour per month. Assume that the monthly electric consumptions by all households have a normal distribution with a mean of 1675 kilowatUhour and a standard deviation of 220 kilowatts/hour. (i) Find the probability that the monthly electric consumption of a selected household is less than 1700 kilowatt/hour. (ii) Find the percentage of the households if the monthly electric consumption between 850 to 1420 kilowatt/hour. (iii) If there are 15 houses selected at random, nd the percentage that the average monthly electric consumption of the selected houses more than 1800 kilowatt/hour. (iv) Calculate the probability if the average monthly electric consumption of that selected house is fewer than 1500 kilowatt/ hour