Answer:
first and last
Step-by-step explanation:
Total observations:
3 + 7 + 7 + 4 + 1 = 22
There are 22 observations, so data from 22 households
Median position: (n + 1)/2
(22 + 1)/2 = 23/2 = 11.5th value
median is the average of 11th and 12th values, both are 2. So the average is also 2
Therefore, Centre is at 2
Answer:
a) 8 seconds
b) 3 seconds
c) 170 meters
Step-by-step explanation:
a) When the ball lands in the sea, s = -80.
-80 = 30t − 5t²
5t² − 30t − 80 = 0
t² − 6t − 16 = 0
(t + 2) (t − 8) = 0
t = -2 or 8
t = 8 seconds
b) The ball reaches its highest point when the velocity is 0 (or at the vertex of the parabola).
t = -b / (2a)
t = -30 / (2 × -5)
t = 3 seconds
c) The highest point is:
s = 30(3) − 5(3)²
s = 45
So the ball rises 45 meters, falls 45 meters, then falls 80 meters.
The total distance traveled is 45 + 45 + 80 = 170 meters.
