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3 years ago

1/2(a+b)-(a-b)exponent2 when a=18 and b=14

Mathematics

1 answer:

lora16 [44]3 years ago

8 0

Answer:

Step-by-step explanation:

Substitute the given values for a and b into the expression

$\frac{1}{2}$ (18 + 14) - (18 - 14)²

= $\frac{1}{2}$ × 32 - 4²

= 16 - 16

= 0

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Answer:

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3 years ago

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3 years ago

A group of married couples takes an IQ test. The average husband's IQ is 105 with an SD of 15 and the average wife's IQ is 110 w

Aloiza [94]

Answer:

Wife' s IQ = 100

0.2% are smarter than their wives.

Step-by-step explanation:

We are given the following information in the question:

Husband:

Mean = 105

SD = 15

Wife:

Mean = 110

SD = 10

Correlation between husband's and wife's IQ = 0.5

a) Let the husbands be represented by X and wives by Y.

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Standardizing the scores, we get:

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

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$Z_Y = rZ_X$

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So,

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3 years ago