percent of boy students are 37.5% :) so c
Answer:
n = 3.666 or (3 and 2/3)
Step-by-step explanation:
4.5n + 2.5 = 19
4.5n = 19 - 2.5
4.5n = 16.5
n = 16.5 / 4.5
n = 3.666 or (3 and 2/3)
Point/Slope Form of an equation!
(5,3)
slope of -2/5
x= 5
y = 3
y - y1 = m(x-x1)
y - 3 = -2/5(x-5)
y - 3 = -2/5x + 2
y = -2/5x + 5
x intercept of 5
We are given the following variables:
μ = the sample mean = 152 pounds
σ = the standard deviation = 26 pounds
x = the sample value we want to test = 180 pounds
n = the sample size = unknown
MOE = margin of error = 4% = 0.04
Confidence level = 96%
The first thing we can do is to find for the value of z
using the formula:
z = (x – μ) / σ
z = (180 – 152) / 26
z = 1.0769 = 1.08
Since we are looking for the people who weigh more than
180 pounds, therefore this is a right tailed z test. The p value is:
p = 0.1401
Then we can use the formula below to solve for n:
n = z^2 * p * (1 – p) / (MOE)^2
n = 1.08^2 * 0.1401 * (1 – 0.1401) / (0.04)^2
n = 87.82 = 88
Therefore around 88 people must be surveyed.
To find the approximately volume you will use the formula for finding the volume of a cylinder:
V = pi x r^2 x h
3.14 x 0.5^2 x 21
V = 16.485
The volume is approximately 16.49 cubic inches.
