The median is 7. By definition of "median," half of the data values are below 7; half are above 7. Thus, the first statement is FALSE.
Spread: in the 2nd statement we are comparing the spread from lower quartile (4) to the median (7) and that from the median (7) to the upper quartile (9). In other words, we're comparing 3 to 2. This statement is TRUE.
The 3rd statement is the opp. of the 2nd statement, and thus is FALSE.
The 4th statement is FALSE. See my comments regarding the 1st statement.
Driving 70 miles per hour. Slow your speed means decrease in speed= 70+(-15)=70-15=55 miles/ hr And then return to speed of 70 miles/hr means add 15 miles to the speed. We get 70+(-15)+15 =70 miles / hr
