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The weights of bags of ready-to-eat salad are normally distributed with a mean of 290 grams and a standard deviation of 10 grams.

What percent of the bags weigh less than 280 grams?




a) 13.5%

b) 16%

c) 34%

d) 36.5%

User Raajkumar
by
8.1k points

1 Answer

2 votes
290-10=280

280 is one standard deviation below.
All that are above mean is 50%.
One standard deviation below is 34%.
50%+34%=84% all of these bags weigh more than 280 g.
So,
100%-84%=16% should be bags that are less than 280 g.

Answer is b) 16 %.

User Avijit Gupta
by
8.6k points
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