F.3升 F.4 Maths 40分急!

[匿名]

2010-08-08 5:05 am

1. Michael is going to make an investment. If he wants to have a minimum
return of double his principle in five years, what should be the corresponding
interest rate? Find out one possible interest rate and verify it.
2. In a set of data, the mean, median and mode are all the same as 5. If each
data in that data set is smaller than 10 and there are only 2 ‘5’s in that
data set, try to find a possible set of data with such properties.
Please verify your answer.

回答 (1)

匿名

2010-08-08 5:13 am

✔ 最佳答案

1. Michael is going to make an investment. If he wants to have a minimum
return of double his principle in five years, what should be the corresponding
interest rate? Find out one possible interest rate and verify it.
Let his principle be $x, and required interest rate be r%p.a.
x(1+r%)^5 = 2x
(1+r%)^5 = 2
1+r% = 2^(1/5)
r = [2^(1/5) - 1]*100
r = 14.9 (corr to 3 sig fig)
The possible interest rate is 15%.
2. Given there is 2 "5",
Let the set of data be x,5,5,y,
x,y<10
(x+5+5+y)/4 = 5
x+y+10 = 20
x+y=10
x&y can be 1&9,2&8,3&7,4&6,
One possible set of data is 1,5,5,9

參考: Hope can help you^^”

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