có bao nhiêu giá trị nguyên của tham số m để phương trình : x²-(m+3)x+2m+2=0 có hai nghiệm x1,x2 thỏa mãn 0

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.)