Can someone help explain the following problem? .5(g+10)=50

Mathematics

2 answers:

lina2011 [118]3 years ago

6 0

0 is the answer. 0+10 is 10, 10*5 is 50, 50=50.

GaryK [48]3 years ago

4 0

Well, first you need to distribute the .5 to everything in the parenthesis. so you would come out with:
.5g + 5 = 50
now, you want to isolate the variable. so subtract 5 from both sides. You're left with
.5g = 45
now, divide 45 by .5
you're left with g = 90!

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At a Psychology final exam, the scores are normally distributed with a mean 73 points and a standard deviation of 10.6 points. T

USPshnik [31]

Answer:

The score that separates the lower 5% of the class from the rest of the class is 55.6.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question:

$\mu = 73, \sigma = 10.6$