Hello, please help!!!

(1 point) Consider a normal distribution curve where 55-th percentile is at 15 and the 15-th percentile is at 8. Use this information to find the mean, M , and the standard deviation, 0' , of the distribution. Note: this is a tricky problem, you should get out a pen and paper and work through it carefully. a)M= b)a= (1 point) Consider a normal distribution curve where the middle 60 % of the area under the curve lies above the interval ( 10 , 20 ). Use this information to find the mean, u , and the standard deviation, o , of the distribution. a M = b) o =