Answer:
c
Step-by-step explanation:
Answer:
Surface Area: 615.75
Volume: 1436.76
Step-by-step explanation:
The equation for the surface area of a sphere is 4*pi*r^2
Just do 4*3.14*7*7
The equation for the volume of a sphere is 4/3*pi*r^3
Just do 1.33*3.14*7*7*7
a. Find the probability that an individual distance is
greater than 214.30 cm
We find for the value of z score using the formula:
z = (x – u) / s
z = (214.30 – 205) / 8.3
z = 1.12
Since we are looking for x > 214.30 cm, we use the
right tailed test to find for P at z = 1.12 from the tables:
P = 0.1314
b. Find the probability that the mean for 20 randomly
selected distances is greater than 202.80 cm
We find for the value of z score using the formula:
z = (x – u) / s
z = (202.80 – 205) / 8.3
z = -0.265
Since we are looking for x > 202.80 cm, we use the
right tailed test to find for P at z = -0.265 from the tables:
P = 0.6045
c. Why can the normal distribution be used in part (b),
even though the sample size does not exceed 30?
I believe this is because we are given the population
standard deviation sigma rather than the sample standard deviation. So we can
use the z test.
.85 * 10^-4 is the scientific notation
Answer:
A,B,D are true C is false