The only solution is x=7
Although the problem is solves correctly, always makes sure to check it by inputting it back into the equation. Putting -3 into the equation, one side turns negative and the other is positive. For this reason, it is impossible for one of the answers to be -3.
First we have to find which percent of 2000 numbers are 1360 numbers.
p = 1360 / 2000 * 100 = 68 %
It means that for normal distribution the values 40 and 50 are within +/- 1 standard deviation from the mean ( 45 ).
45 - x = 40 and 45 + x = 50.
x = 45 - 40 = 50 - 45 = 5
Answer:
x = 5
Total distance = sum of the distances run:60 km + 45km = 105 km
Displacement: difference between iniital position and final position: 0 + [60km - 45km] = 15 km