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1 answer:
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Answer:
3.08 km/h.
Step-by-step explanation:
We know that,
Ali traveled at a speed of s km/h for 2.5 hours.
Let d be the distance and t be the time.
...(1)
On his return journey, he increased his speed by 4 km/h and saved 15 minutes. So, distance is d and times is t-15.
...(2)
From (1) and (2), we get
Put t=40 in (1).
So, t=40 and d=100.
Now,
Total distance = d + d = 100 + 100 = 200
Total time = t + t - 15 = 40 + 40 - 15 = 65
So, the average speed is
Therefore, the average speed is 3.08 km/h.
Answer:
Do not reject
Step-by-step explanation:
From the question we are told that
Sample size
Sample size
Sample proportion 1
Sample proportion 2
95% confidence interval
Generally for 95% confidence level
Level of significance
Therefore
Generally the equation for confidence interval between is mathematically given as
Therefore
Confidence interval is
Conclusion
Given the confidence interval has zero
Therefore do not reject