Number of times the car ran out of petrol. (More detail given)?
A car ride uses a mean of 7 litres of petrol with a standard deviation of 0.5 litres. Assuming that the amount of petrol used is normally distributed.
i) If the car usually has only 8 litres in its tank, how many times in next 1000 rides will the car ran out of petrol?
After calculation answer comes to 22.8 times. Now should the answer be 22 times or 23 times
2006-11-01 19:59:25 · 4 answers · asked by prashmanic 4 in Science & Mathematics ➔ Mathematics
If this is for a statistics course, chances are you are allowed to run out 22.8 times. If you must round, 23 would be more correct, but as answers never come out to integers in statistics, my guess is that you are to put the decimals.
2006-11-01 20:01:41 · answer #1 · answered by topher8128 2 · 0⤊ 0⤋
You should round it to nearest integer that 23. If it would have been 22.4 you can safely say 22.
In exam better write answer as 22.8 (approx 23). You will get full marks
2006-11-02 04:02:54 · answer #2 · answered by mcubea 2 · 1⤊ 0⤋
You have to give more information : When is the car refilled ? is this after each ride ?
In thais case you have to normalize and then look for what x the interal from +x to INF is more than 8 liters.
2006-11-02 04:03:52 · answer #3 · answered by gjmb1960 7 · 0⤊ 0⤋
round up to 23.
2006-11-02 04:01:22 · answer #4 · answered by ~Amber~ 4 · 0⤊ 0⤋