A standard normal distribution has a mean of zero; half the bell curve is to the left of zero and half to the right.
A standard normal distribution has a standard deviation of 1 and follows the 68-95-99.7 rule; e.g. 99.7% of the probability is between -3 and +3.
Choice a
The answer is 9/42. might be wrong I'm rusty on this.
x-values can be anything since we don't have any x term to substitute.
It can also be explained by a graph. The constant graph is a horizontal graph and it shows that x can be any real numbers.
............................the answer is ($63)