The test scores of 1200 students are normally distributed with a mean of 83 and a standard deviation of 5.5 under which interval did approximately 978 students score

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

hope this !

you can't solve x because it is 2 linear equation and you only have one equation