answer all questions with explanation

Exercise V: . The parts ofthis exercise are independent. 1) A normal distribution has a mean of 90 and a standard deviation of 21. a) What range of values represents the middle 68% of the data? (I point) b) What percent of the data will be less than 48? (1 point) e) What range of values represents the upper 16% of the data? (1 point) 2) A bag contains marbles which are listed from A to D. The table shows the number of the marbles in the bag according to its number. I- a) Construct a relative frequency table. (1 point) b) Graph the probability distribution. (1 point) e) Determine whether the data can be approximated with a normal distribution. (1 point)