Answer:
Last option:
x ≤ 217
Explanation:
Mean time = Total Time/Number of observations
Mean time = (192 + 206 + 194 + 191 + x)/5 = (783 + x)/5
We want this mean time to be no greater than 200 seconds.
In other words we want mean time ≤ 200 s
We therefore get the inequality:
(783 + x)/5 ≤ 200
Multiplying both sides by 5
=> (783 + x) · 5 ≤ 200 · 5
=> 783 + x ≤ 1000
=> x ≤ 1000 - 783
=> x ≤ 217