91影视

As we only want the probability for citizens with IQ scores of 6 and above, we will first add the number of citizens in all 3 columns with an IQ of 6 and above.

Invest in Market = 10,270+ 6698 + 5135 + 4464 = 26,567

No investment = 21673 + 11260 + 7010 + 5067 = 45,010

Total = 26567 + 45010 = 71,577

Let A be the total number of people with an IQ of 6 or above.

B be the number of people with an IQ of 6 or above who invest in the market.

To find the probability that the Finnish citizen has an IQ score of 6 or higher and invests in the stock market,

$\begin{array}{c}\text{P=}\frac{\text{B}}{\text{A}}\\ \text{=}\frac{\text{26567}}{\text{71577}}\\ \text{=0.37}\\ \text{=37\%}\end{array}$

Therefore,$P\left(B|A\right)=37\%$.

Let鈥檚 add the number of citizens with an IQ of 5 or less for all columns,

Invest in Market = 893 + 1340 + 2009 + 5358 + 8484 = 18,084

No investment = 4659 + 9409 + 9993 + 19682 + 24640 = 68,383

Total = 18084 + 68383 = 86,467

Let鈥檚 assume

C = total number of people with an IQ of 5 or below

D = number of people with an IQ of 5 or below who invest in the market

$\begin{array}{c}\text{P=}\frac{\text{D}}{\text{C}}\\ \text{=}\frac{\text{18084}}{\text{86467}}\\ \text{=0.2091}\\ \text{=20.91\%}\end{array}$

Therefore,$P\left(C|D\right)=20.91\%$

$\text{P}\left(\text{B|A}\right)\text{>P}\left(\text{C|D}\right)$

Investing in stocks does depend on IQbecause the probability that a citizen with IQ of 6 or above is greater than the probability of a citizen investing who has IQ of 5 or below.

There are more chances that a person with a higher than 6 IQ will invest in stocks.