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39. Weekly wages of workers in a factory are as follows:Weekly wages in ) 325-350 350-375 375 -400 400 -425 425- 450No. of workers5 I 15 I 10 I 20 I 155Find the probability that a worker selected at random earns:a) 400 or moreb) 375 or more but less than 425.b) At least 375.d) up to 400​

Answer»

The PROBABILITIES are 0.538,0.462,0.692,0.462 respectively.

  • The TOTAL no of workers are 5+15+10+20+15=65
  • The no of workers with weekly WAGES 400 or more = 35(20+15)
  • The no of workers with weekly wages 375 or more but less than 425 = 30(10+20)
  • The no of workers with weekly wages at least 375  = 45 (10+20+15)
  • The no of workers with weekly wages up to 400 = 30(5+15+10)

The probability that worker earns :

  1. 400 or more = 35/65 = 0.538
  2. 375 or more but less than 425 = 30/65 = 0.462
  3. at least 375 = 45/65 = 0.692
  4. up to 400 = 30/65 = 30/65


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