Answer:
5°
Explanation:
Mean of the data set is one of the most commonly used measures of central tendency. Basically, it means the average value of the data set. For finding it, one doesn't have to arrange the data in order. All it takes is to add them all together and divide that by the number of the data. It can be mathematically written as:
(x1 + x2 + x3 + ..... + xn) / n
This obviously means that Ashrita did the best job in calculating the mean of this data set. Let us mark the launching point with A, bottom of the tree with B and top of the tree with C.
In this way, we get a right triangle whose sides are AB = 250 yards (which is 750 feet) and BC = 65 feet.
We want to know the angle CAB (the angle at point A) and we can determine this using trigonometric functions.
Since we know the length of the opposite and the adjacent sides to this angle, we will use tangent of an angle (tan).
tan = opposite side / adjacent side
tan = 65 / 750 = 0.087
Now, knowing the tan of an angle, we can find the angle using the arctan function:
arctan (0.087) = 4.97° which we can round to 5°.
That means that, moving in a straight line and at constant angle, balloon needs to have an angle of elevation of at least 5° in order to avoid hitting the tree.