in a certain country, the true probability of a baby being a is . among the next randomly selected births in the country, what is the probability that at least one of them is a ?

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?