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Pavel [41]
4 years ago
14

Can x-2 ever be less than 0? How do you figure that out?

Mathematics
1 answer:
larisa [96]4 years ago
4 0
If x is 1,0, or a negative number it can be less than 0
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Scores on a test have a mean of 78.2 and 8 percent of the scores are above 89. The scores have a distribution that is approximat
anyanavicka [17]

Answer:

The standard deviation is 7.7

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 problem, we have that:

\mu = 78.2

8 percent of the scores are above 89

This means that X = 89 has a pvalue of 1 - 0.08 = 0.92. So when Z = 89, Z = 1.405.

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

1.405 = \frac{89 - 78.2}{\sigma}

1.405\sigma = 10.8

\sigma = \frac{10.8}{1.405}

\sigma = 7.7

The standard deviation is 7.7

5 0
3 years ago
Three 24 hour clocks show the time to be 12 noon. One of the clocks is always correct, one loses a minute every 24 hours, and on
umka21 [38]
All three clocks will show the same time in 1 day.
5 0
3 years ago
Find the mean ,median, and mode round to the nearest tenth if necessary for 9.3, 8.4, 8.0, 9.1, 9.4, 9.0, 7.8, 9.3, 8.0
Ivenika [448]
Mean-1.6
median-9.0
mode-8.65    8.0 and 9.3=17.3/2 is 8.65
8 0
4 years ago
(2x−6)+4(x−3) <br> This is for math and I am very confused, please help
Alex Ar [27]

Answer:

6x-18

Step-by-step explanation:

(2x-6)+4(x-3)

you distribute the 4 by multiplying it with the variables within the parenthesis.

(2x-6)+(4x-3)

you can loose the parenthesis and group common factors together.

2x+4x-6-3

add

<u>6x-18</u>

5 0
3 years ago
Read 2 more answers
Find the measure of angle x in the figure below:<br><br><br> 65°<br> 70°<br> 110°<br> 125°
SVETLANKA909090 [29]
180-(55x2)=70

Those two angles are the same... I forget the name of the law that states it, but that's the answer... x=70
8 0
4 years ago
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