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Sunny_sXe [5.5K]
2 years ago
9

List the first 10 triangular numbers

Mathematics
1 answer:
Paha777 [63]2 years ago
7 0
Answer:

0, 1, 3, 6, 10, 15, 21, 28, 36, 45
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IQ scores on the WAIS test approximate a normal curve with a mean of 100 and a standard deviation of 15. What IQ score is identi
riadik2000 [5.3K]

Answer:

IQ scores of at least 130.81 are identified with the upper 2%.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Mean of 100 and a standard deviation of 15.

This means that \mu = 100, \sigma = 15

What IQ score is identified with the upper 2%?

IQ scores of at least the 100 - 2 = 98th percentile, which is X when Z has a p-value of 0.98, so X when Z = 2.054.

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

2.054 = \frac{X - 100}{15}

X - 100 = 15*2.054

X = 130.81

IQ scores of at least 130.81 are identified with the upper 2%.

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3 years ago
What is 10% of 70m awnser?
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The answer is 7. That's the answer
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The price of a watch was increased by 20% to 198. What was the price before the increase?
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To find the original price before the increase, divide the new price by 1 + the percent of increase.

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I cant give you the answer without the picture but I can tell you how to solve it.

if all the sides are the same length just multiply one of the numbers by the sides, for example, a rubics cube is 9 cm on each side. 9*6=54, so the answer would be 54 cm

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Solve. -1/3b = 9<br> A.-3<br> B.3<br> C.-27<br> D.27
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Ok so lets plug in a first -1/3(-3) would equal 9 a is the accurate  answer
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