Which step(s) would create equations so that the coefficients of one of the variables are

Mathematics

1 answer:

bekas [8.4K]3 years ago

8 0

The answer would be (D) Multiply the second equation by 4.

The second equation would become 8x - 8y = -28, and the 8y from the first equation and the -8y from the second would cancel out and you can solve for x.

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A large number of applicants for admission to graduate study in business are given an aptitude test. Scores are normally distrib

DiKsa [7]

Answer:

The fraction or percentage of the applicants that we would expect to have a score of 400 or above is 77.34%

Step-by-step explanation:

Scores are normally distributed with a mean of 460 and a standard deviation of 80. For a value x, the associated z-score is computed as $z = \frac{x-460}{80}$ , therefore, the z-score for 400 is given by $z_{0} = (400-460)/80 = -0.75$ . To compute the fraction of the applicants that we would expect to have a score of 400 or above, we should compute the probability P(Z > -0.75) = 0.7734, i.e., the fraction or percentage of the applicants that we would expect to have a score of 400 or above is 77.34%