It has been found from experience that the mean breaking strength of a particular brand of thread is 9.63N with a standard deviation of 1.40N. Recently a sample of 36 pieces of thread showed a mean breaking strength of 8.93N. Can we conclude that the thread has become inferior?

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?

Asoccer team has played 25 games and has won 60% of the games it has played. what is the minimum number of additional games the team must win in order to finish the season winning 80% of the games it has played?

If your not fit to drive you have a responsibility to