Reference no: EM133245293

1. A small sample of toys has 50 spinning tops in a toy manufacturing company. 2% of the spinning tops are defective. We randomly select 4 of these toys out of this sample. What is the discrete probability distribution of the defective toys in the sample?

2.Surface-finish defects in a small electric appliance occur at random with a mean rate of 0.2 defects per unit. Find the probability that a randomly selected unit will contain at least three surface-finish defect.

3.The output voltage of a power supply is normally distributed with mean 110 V and standard deviation 0.08 V. If the lower and upper specifications for voltage are 109.95 V and 110.05 V, respectively, what is the probability that a power supply selected at random will conform to the specifications on voltage?

4.The tensile strength of a fiber used in manufacturing cloth is of interest to the purchaser. Previous experience indicates that the standard deviation of tensile strength is 5 psi. A random sample of 15 fiber specimens is selected, and the average tensile strength is found to be 180 psi. Construct a 95% lower confidence interval on the mean tensile strength.