Homework SourseThe Virginia cooperative extension reports that the mean wei
The Virginia cooperative extension reports that the mean weight of yearling angus steers is 1152 pounds. Suppose that weights of all such animals can be described by a normal curve with s standard deviation of 84 pounds?
What percentage of Angus steers weigh under 1100 pounds?
The Virginia cooperative extension reports that the mean weight of yearling angus steers is 1152 pounds. Suppose that weights of all such animals can be described by a normal curve with s standard deviation of 84 pounds?
What percentage of Angus steers weigh under 1100 pounds?
What percentage of Angus steers weigh under 1100 pounds?
Solution
We first get the z score for the critical value. As z = (x - u) / s, then as
x = critical value = 1100
u = mean = 1152
s = standard deviation = 84
Thus,
z = (x - u) / s = -0.619047619
Thus, using a table/technology, the left tailed area of this is
P(z < -0.619047619 ) = 0.267942495 or 26.79% [ANSWER]
