1.a.The area below z = 0.8.
b.The area above = 1.2.
c. The area between z = -1 and z = 2
The standard normal curve is the probability distribution curve of the normal random variable with mean 0 and standard deviation 1. The total area under the standard normal curve is 1.
Use standard normal table or z table to find the required probability.
(a) Observe the probability value in the z-table at 0.8 for z. The required area is 0.7881.
Observe the probability value in the z-table at 1.2 for z. The required area is 0.8849. Subtract the obtained probability value from 1 to obtain the area right to 1.2.
Answer is given below (on video)
An article reported that, in a study of a particular wafer inspection process, 356 dies were examined by an inspection probe and 239 of these passed the probe. Assuming a stable process, calculate a 95% (two-sided) confidence interval for the proportion of all dies that pass the probe. (Round your answers to three decimal places.)