You plan to invest 15% of your current income this year. Where would you invest your money and why? List all options and explain, in detail, the reason for choosing them. I need help ASAP, please !! paragraph-long answer

Which rational number could be graphed between -4 and -5

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

I’m stuck on this equation, anyone got the answer?