Help PLease I'm out of time ;(The ratio relationship of water to cement in a concrete mixture is shown on the graph below. Which of the following ratio tables corresponds to the ratio relationship demonstrated on the graph? All Answers and coordinate plane are the pictures.

The life (in hours) of a magnetic resonance imagining machine (mri) is modeled by a weibull distribution with parameters β = 2 and δ = 370 hours. (a) determine the mean life of the mri. (round your answer to 2 decimal ) determine the variance of the life of the mri. (round your answer to 1 decimal ) what is the probability that the mri fails before 250 hours? (round your answer to 4 decimal places.)