Exponential decay with y intercept (0,5)

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

The birth weights of newborn babies in the unites states follow in a normal distrubution with a mean of 3.4 kg and standard deviation of 0.6 kg. reaserches interested in studying how. children gain weights decide to take random samples of 100 newborn babies and calculate the sample mean birth weights for each sample

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.