Melody

Grown up?  Arn't kids supposed to leave home when they grow up?

Arn't parents ever entitled to a bit of peace and quiet?  :/        :D

ok I get it, thanks Heureka :)

Thanks Alan, yes it is about convention and now Heureka has explained it I can see that there is a really good reason to do it this way around.  Thanks Heureka for explaining it :)

A piece of equipment cost $85,000 new but despite (devaluates?) 15% every 5 years. Find its value after 30

years.

$$\\FV= 85000(1-0.15)^6\\\\
FV= 85000*0.85^6\\\\$$

$${\mathtt{85\,000}}{\mathtt{\,\times\,}}{{\mathtt{0.85}}}^{{\mathtt{6}}} = {\mathtt{32\,057.708\: \!828\: \!125}}$$

$32058  to the nearest dollar :)

I assume that this is for some given time period ?

Suppose there are 300,000,000 people each at an independent risk of 1/10,000,000 of dying. What is the probability that exactly 30 people die (which is the expected value)?

30 people die   299999970 live

Prob of dying = 10^(-7)

prob of not dying = 1-10^(-7)

P(30 die)=300000000C30 * (10^(-7))^30*(1-10^(-7))^299999970

P(30 die)=300000000C30 * 10^(-210)*(1-10^(-7))^299999970

The web2 calc won't do this calc for me but I saw a pop up of Alan's answer anyway :)

I think that it is the same as Alan's :/

I already answered this somewhere else today !

Thanks Heureka,

Could you please tell me what this means?

Thank you Alan, that makes good sense.  I have not seen it before :))

The numbers being the  wrong way around is confusing.

I wonder why Mr Massow did that ?   (surely it is not normal)

Yes, that is excellent  DL :))