Consider the probability distribution below

x. F(x)

10. .2

20 .3

30 .4

40 .1

the variance of x equals

a. 85

b 93.33

c 84

d. 9.165

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- I get the first part and second part. When I get to 100 times zero point two I get lost
- rekennaclay
- Oct 01, 2018 at 8:13pm

- There we are finding the variance, square each x value then multiply by the respective probabilities,
- Dinoco12
- Oct 01, 2018 at 8:27pm

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- Can you break this down for me more please. I didn't get the right answer when I tried it
- rekennaclay
- Oct 01, 2018 at 7:33pm

- I got 904.7
- rekennaclay
- Oct 01, 2018 at 7:33pm

- please let me know which part because it just need to put in calculator
- SumitK21
- Oct 01, 2018 at 7:36pm

- 10^2 *0.2 =20 and 20^2*0.3 =120 and 30^2*0.4=360 and 40^2*0.1=160 and 24^2 =576
- SumitK21
- Oct 01, 2018 at 7:38pm

- [20 + 120 + 360 + 160 ] - 576= 660 - 576 = 84
- SumitK21
- Oct 01, 2018 at 7:38pm

- The second part I put it in the calculator and ended with a different answer. The variance part.
- rekennaclay
- Oct 01, 2018 at 7:43pm

- i have broken every number, please check and let me know
- SumitK21
- Oct 01, 2018 at 7:48pm

- Okay thanks
- rekennaclay
- Oct 01, 2018 at 7:49pm