Assume the random variable X is normally distributed with mean
=50 and standard deviation =7. Find the 77 th percentile.
The mean incubation time of fertilized eggs is 2020 days.
Suppose the incubation times are approximately normally distributed
with a standard deviation of 11 day.
(a) Determine the 15th percentile for incubation times.
(b) Determine the incubation times that make up the middle
95%.
Assume that the random variable x is normally
distributed with mean μ = 70 and standard deviation
σ = 10. Find P(x < 82)
a. 0.9942
b. 0.4500
c. 0.1151
d. 0.8849
1)Assume that the random variable X is normally distributed,
with mean μ = 70 and standard deviation σ = 13.
A)Find P(X ≤ 65) =
B) Find P(X > 55) =
C) Find P(X > 78) =
D) Find P(X > 78) =
2)The length of zebra pregnancies is normally distributed, with
mean μ = 380 and standard deviation σ = 10.
A)Find P(X < 365) =
B)Find P(X > 385) =
A random variable is normally distributed with a mean of 24 and
a standard deviation of 6. If an observation is randomly selected
from the distribution,
a. What value will be exceeded 5% of the time?
b. What value will be exceeded 90% of the time?
c. Determine two values of which the smaller has 20% of the
values below it and the larger has 20% of the values above it.
d. What value will 10% of the observations be...
Suppose that X is normally distributed with a mean of
50 and a standard deviation of 12. What is P(X ≥
74.96)
a) 0.481
b) 0.019
c) 0.981
d) 0.024
e) 0.020
f) None of the above
If X is a normal random variable with mean ( μ ) = 50 and
standard deviation ( σ ) = 40, then the probability of X > 80
is: a. 0.0000 b. 0.7734 c. 1.0000 d. 0.2266