A printer cartridge company claims their ink lasts for more

Last updated: 7/20/2022

A printer cartridge company claims their ink lasts for more than 5,000 words. The number of words printed is normally distributed with a standard deviation of 20 (σ=20) A sample was taken of 50 cartridges and it was found that they had a mean of 4,940 words. Construct a 95% confidence interval (z = 1.96). Using the interval does the company's claim hold true? a. No, the companies claims are above the 95% confidence interval. b.Yes, the companies claims fall within the 95% confidence interval. c. No, the companies claims are below the 95% confidence interval. d. Yes, the companies claims are below the 95% confidence interval.