Among a group of 2500 people, 35 percent invest in municipal bonds, 18 percent invest in oil stocks, and 7 percent invest in both municipal bonds and oil stocks. If 1 person is to be randomly selected from 2500 people, what is the probability that the person selected will be one who invests in municipal bonds but not in oil stocks

• 7/25 is the probability.
  
  35 percent invests in municipal bonds.
  It also includes 7% who invested in both municipal bonds and oil stocks.
  
  So, 35-7 = 28% invests in municipal bonds but not in oil stocks
  
  Therefore, probability = 28/100 = 7/25
  
  7/25 is probability of person only invest in municipal bonds.
• 12 years agoHelpfull: Yes(37) No(2)
• total no.of people = 2500
  municipal bonds = 2500*35/100 = 875
  oil stocks = 2500*18/100 = 450
  municipal bonds and oil stocks(both) = 2500*7/100 = 175
  
  We need only person who invests in municipal bonds
  i.e., municipal bonds - both(X) = 875-175 = 700
  The probability is = X/total = 700/2500 = 7/25
• 12 years agoHelpfull: Yes(31) No(0)
• investor in municipal =35*2500/100=875
  so probability = 875/2500=0.35
  investor in both= 7*2500/100= 175
  so probability= 175/2500=0.07
  hence for municipal only = .35-.07=.28
• 12 years agoHelpfull: Yes(7) No(2)
• total people = 2500
  
  35% on n(m)= 35/100 * 2500 = 875 municipal bonds.
  
  7% on n(m intersection o) = 7/100 * 2500 = 175 both.
  
  we need only municipals = (875 - 175) = 600.
  
  the propability, N(E)/N(S) = 600/2500 = 6/25 ..
• 12 years agoHelpfull: Yes(2) No(13)
• 0.42 ans
  35% of 2500 is 875
  7% of 2500 is 175
  18% of 2500 is 450
  acc. to rule 1050/2500=0.42
  
  
• 12 years agoHelpfull: Yes(1) No(5)