Recently the stock market took big swing up and down A surve

Recently, the stock market took big swing up and down. A survey of 1011 adult investors asked how often they tracked their portfolio. The table shows the investor responses. What is the probability that an adult investor tracks his or her portfolio daily? Express your answer as a simplified fraction and as a decimal rounded to three decimal places.

Solution

P(daily) = 222/total = 222/(222+281+297+144+67) = 222/1011 = 0.21958 ~= 0.22

Option (A) is correct.