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s344n2d4d5 [400]
2 years ago
12

According to Chemical Engineering, an important property of fiber is its water absorbency. The average percent absorbency of 25

randomly selected pieces of cotton fiber was found to be 20 with a standard deviation of 1.5. A random sample of 25 pieces of acetate yielded an average percent of 12 with a standard deviation of 1.25. Is there strong evidence that the populationJ.mean percent absorbency is significantly higher for cotton fiber than for acetate
Mathematics
1 answer:
marusya05 [52]2 years ago
3 0

Answer:

Step-by-step explanation:

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Describe a way to calculate 304-81 mentally by using reasoning other that the common subtraction algorithm. Then write a coheren
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A simple way to mentally subtract is to simplify the numbers, subtract, then subtract or add for the simplified answer.

Step-by-step explanation:

A simple way to mentally subtract is to simplify the numbers, subtract, then subtract or add for the simplified answer. For this 304 - 81 is easier as 300 - 80. Make note that we took away 4 from 304 and 1 from 81. Now we just subtract mentally, and 300 - 80 = 220. If we took 4 from 304, this means that our answer should be 4 less, since 4 less would be 304 - 80 = 216. If we took 1 from 81, then we add 1 back to get the equation 304 - 81 = 217.

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300 - 80 = 220

304 - 80 = 216

304 - 81 = 217

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