Question

given the figure below, which formula will give the correct answer?
select the correct response:
normalcdf (z, 9e99)
normalcdf (-9e99, z)
normalcdf (-z, -9e-99)
normalcdf (-z, 9e99)
normalcdf (9e99, z)
normalcdf (-9e-99, -z)
normalcdf (-9e99, -z)
my answer is not listed among the given choices.

Explanation:

Step1: Identify shaded region

The shaded area covers from the far left (negative infinity, represented by -9E99 in calculator notation) up to the z-score on the right.

Step2: Match to cdf function

The normalcdf(a, b) function calculates the area under the normal curve from \(a\) to \(b\). Here, \(a = -9E99\) (lower bound) and \(b = z\) (upper bound), so the formula is $\text{normalcdf}(-9\text{E}99, z)$.

Answer:

normalcdf (-9E99, z)