Anew photocopier works 2 times as fast as an old one when the machines work together a university can produce all its staff manuals and 28 hours find the time it would take each machine working alone to complete the job

Which of the following is the result of expanding the series

Arandom sample of n = 25 observations is taken from a n(µ, σ ) population. a 95% confidence interval for µ was calculated to be (42.16, 57.84). the researcher feels that this interval is too wide. you want to reduce the interval to a width at most 12 units. a) for a confidence level of 95%, calculate the smallest sample size needed. b) for a sample size fixed at n = 25, calculate the largest confidence level 100(1 − α)% needed.

What is the value of x in the equation 15(x + 4) - 3 = 4.5(x - 2)?