1.
a) For a standard normal distribution, find c if P(z < c) =
0.4756 c =
b) For a standard normal distribution, find c if P(z > c) =
0.2399 For greatest accuracy, don't use Z tables. c =
Let z be a random variable with a standard normal
distribution.
Find “a” such that P(|Z| <A)= 0.95
This is what I have:
P(-A<Z<A) = 0.95
-A = -1.96
How do I use the symmetric property of normal distribution to make
A = 1.96?
My answer at the moment is P(|z|< (-1.96) = 0.95
1. If Z is a standard normal random variable, find
c such that P(−c ≤ Z ≤
c) = 0.82. [Answer to 2 decimal places]
2. Weakly earnings on a certain import venture are approximately
normally distributed with a known mean of $353 and unknown standard
deviation. If the proportion of earnings over $386 is 25%, find the
standard deviation. Answer only up to two digits after decimal.
3. X is a normal random variable with mean μ and
standard...
Let z be a random variable with a standard normal distribution.
Find P(0 ≤ z ≤ 0.46), and shade the corresponding area under the
standard normal curve. (Use 4 decimal places.)