3 years ago

Pls help me asap!!!!

Mathematics

1 answer:

RUDIKE [14]3 years ago

5 0

Answer:b

Step-by-step explanation:y=2x-3

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The length of a rectangle is 3 cm less than twice the width. If the perimeter is 42 cm, what is the length of the rectangle?

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Answer:

The length is 13

Step-by-step explanation:

w+w+l+l= perimeter

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3 years ago

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 20. Find the prob

Ipatiy [6.2K]

Answer:

Randomly selected adult has an IQ less than 136 is 0.9641

Step-by-step explanation:

It is given that, it is normal distribution with mean 100 and SD as 20.

So, let's use the formula of z-score

z= $\frac{x-mean}{SD}$

For this problem,

x= 136

Plug in this value into the formula

z-score= $\frac{136-100}{20}$

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Now, use z-score table to find the probability

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So, Randomly selected adult has an IQ less than 136 is 0.9641

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