Mike and kim invest $18,000 in equipment to print yearbooks for schools. each yearbook costs $5 to print and sells for $30. how many yearbooks must they sell before their business breaks even?

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