 #1

I met a question about mortality rate: I don’t think there is any relation between mortality rate and urban:rural split ratio. But actually the question forces you to think by that way. Otherwise, you cannot work it out.

Any suggestions?

thanks!

#2

my guess would be 8.6

8.8 is the weighted ave mortality rate between urban and rural. so [ 4.5ruralMOR + 19.7] / 5.5 = 8.8

8.8*5.5 = 48.4
-9.7 = 38.7
/4.5 = 8.6

not 100% sure though!

#3

thank you th7269!
that’s great! i agree.

#4

Hi all how you get it i mean ----did you scale the ratio

#5

Th7269, you are bang on.

Iqkhanuk36, Here the only variable is rural mortality rate; all the others are already given.

The formula to work the rural mortality rate would be:

{(urban pop. ratio X urban mortality rate) + ( rural pop. ratio x rural mortality rate)} / (urban pop. ratio + rural pop. ratio) = average mortality rate (please note X = multiplication and / = division)

Now replace the given ones:

=> {(1 x 9.7) + (4.5 X rural mortality rate)} / (1+4.5) = 8.8

=> 9.7 + 4.5 X rural mortality rate = 8.8 X 5.5 (8.8 X 5.5 = 48.4)

=> 4.5 X rural mortality rate = 48.4 - 9.7

=> rural mortality rate = 38.7 / 4.5

therefore, rural mortality rate = 8.6

Hope, it is clearer.