14. 1,40,00,000 pencils are put up straight. all the pencils are of length range 3 to 6 inches. 80% of the pencils have
average of five inches. so the find out the total length spanned by the pencils.
Ans. 1000 to 1500 miles.

• 80% of 14000000 = 11200000
  length covered 5 inches pencils = 11200000*5 = 56000000
  20% of 14000000 = 2800000
  length covered 3 inches pencils = 2800000*3 = 8400000
  length covered 6 inches pencils = 2800000*6 = 16800000
  
  so total length
  min : 56000000 + 8400000 = 64400000 inches TO
  max : 56000000 + 16800000 = 72800000 inches
• 10 years agoHelpfull: Yes(7) No(0)
• just calculate 80 percent of pencils and then multiply with 5 and divide with 6360 because
  1 mile is 6360 inches .....
  then u ll get 1000 miles and
  remaining range is due to 20 percent
  and we dont know about lenght of 20 pencils
  
• 10 years agoHelpfull: Yes(0) No(0)
• length covered by 80% of the pencils
  =
  80
  100
  ×
  14000000
  ×
  5
  =80100×14000000×5 = 56000000 inches
  
  Minimum length covered by remaining 20% of the pencils =
  20
  100
  ×
  14000000
  ×
  3
  20100×14000000×3 = 8400000 inches
  
  Maximum length covered by remaining 20% of the pencils =
  20
  100
  ×
  14000000
  ×
  6
  20100×14000000×6 = 16800000 inches
  
  Hence, total length spanned by the pencils is (56000000 +8400000) to (56000000 +16800000 )
  
  ie, 64400000 inches to 72800000 inches
• 8 years agoHelpfull: Yes(0) No(0)