Complete the simplified ratio:
0.2 : 3.75

5x−4≥12 or 12x+5≤−4 can you with this problem

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !

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.