From the Dance Academy, you go back to the school and then head home. To ride your bike only on roads, you have to go 6 units East to the school , then 3 units South and 3 units West to go home. (1 unit=1km) what total distance did you travel? what was your displacement?

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?