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Burka [1]
3 years ago
11

A particular brand of gasoline has a density of .737g/mL at 25 C. How many grams of this gasoline would fill a 14.1 gal tank (1

US gal = 3.78L)?
Chemistry
1 answer:
Ivan3 years ago
6 0

Answer: 5.06g/mL

Explanation: 14.1÷.737=19.131614654

19.131614654/3.78= 5.0612

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suppose medical records indicate that the length of newborn babies (in inches) is normally distributed with a mean of 20 and a s
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Answer:

  • <u>0.6826 (68.26%)</u>

Explanation:

<u>1) Find the z-scores:</u>

  • z = [X - μ ] / σ

a) z-score for 22.6 inches length

  • X = 22.6
  • μ = 20
  • σ = 2.6

  • z = [ 22.6 - 20 ] / 2.6 = 1.00

b) z-score for 17.4 inches length

  • X = 17.4
  • μ = 20
  • σ = 2.6

  • z = [ 17.4 - 20 ] / 2.6 =  - 1.00

<u>2) Probability</u>

Then, you have to find the probability that the length of an infant is between - 1.00 and 1.00 standards deviations (σ) from the mean (μ).

That is a well known value of 68%, which is part of the 68-95-99.7 empirical rule.

The most exact result is obtained from tables and is 68.26%:

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