(b) According to the American Time Survey, married men aged 25 to 54 who work full sleep an average of 7.43 hours per night. Assume the currently the times that such men sleep per night have a normal...

Extracted text: (b) According to the American Time Survey, married men aged 25 to 54 who work full sleep an average of 7.43 hours per night. Assume the currently the times that such men sleep per night have a normal distribution with a mean of 7.43 hours and a standard deviation of 0.80 hours. Find the percentage of such men who sleep i Between 6.5 and 8.5 hours ii Less than 6 hours