SOLUTION: In 1999 the stock market took big swings up and down. A survey of 978 investors asked how often they tracked their portfolio. The table shows the investor responses. What is the pr

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Question 438873: In 1999 the stock market took big swings up and down. A survey of 978 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?
How Frequently? Response
Daily 220
Weekly 280
Monthly 274
Couple of times/year 141
Don’t track 63
a. 0.225 b. 0.286 c. 0.28 d. 0.144 e. None of the above
Answer by ewatrrr(24785) About Me  (Show Source):
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Hi

A survey of 978 investors asked how often they tracked their portfolio.

Daily               220

Weekly              280

Monthly             274

Couple of times/year 141

Don’t track           63 

total                978

What is the probability that an adult investor tracks his or her portfolio daily

According to this survey, one would expect that probability to be:

 P ( daily) = 220/978 = .225