Al, Betty, and Carl can harvest a strawberry crop in 12 hours if the work together. If each person worked alone, Al could complete the job in 30 hours, and Carl would take twice as long as Betty. How long would it take Carl to do the job
alone? Let x be the time it take Betty to do the job alone.

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