Farbod decided to keep a fitness tracker. He was surprised to learn that there were 21 minutes of awake time during the seven hours when he was supposed to be asleep at night. What percentage of the seven hours was Farbod awake during the night? NEED THE ANSWER NOWW PLZ

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.)