Probability Distribution Question

AriKahn said:

Hey guys,

I've got a question on my assignment that I can't seem to figure out. It has to do with probability distribution.

The questions is in two parts and I've been provided with an incomplete table. Question as follows...

The probability distribution for X is defined by this table:

X	10	20	30	40	50
P(X = x	k	0.3	0.1	k	k

i) Find the value of k
ii) Calculate the mean of X, E(K)

Any help at all will be gladly appreciated,

Thanks in advance,
Ari

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JeffM said:

Probability(X = 10 or X = 20 or X = 30 or X = 40 or X = 50) is what?

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AriKahn said:

Total of 1?

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JeffM said:

Exactly. Good work. The sum of all the probabilities in a distribution equals 1.

So what equation does that suggest to you for finding the value of k?

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AriKahn said:

Can't be that easy can it? I mean, all the ks have different values?

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AriKahn said:

Can't be that easy can it? I mean, all the ks have different values?

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