the duration of the pregnancy of a certain breed of cow is normally distributed with mean
The duration of the pregnancy of a certain breed of cow is normally distributed. with mean days and standard deviation days. On y 2.50 0 of all pregnancies. are shorter than 235 days and 150 0 are longer than 286 days.nly 1% of the components have a life span less than 3500 hours and. 2.500 have a life span greater than 5500 hours. (b) Determine the mean and standard deviation of the life spans of the components. (6). The company gives warranty of 4000 hours on the components.