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Alekssandra [29.7K]

2 years ago

10

The after school craft center has 15 boxes of 64 crayons each. In 12 of the boxes , 28 of the crayons have not been used. All th

e rest have been used how many of the crayons in the center have been used?

1 answer:

netineya [11]2 years ago

8 0

You are going to do 64-28=36

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GuDViN [60]

Probability that a randomly selected adult has an IQ less than 137 is 0.9452

<u>Step-by-step explanation:</u>

<u>Step 1: </u>

Sketch the curve.

The probability that X<137 is equal to the blue area under the curve.

<u>Step 2: </u>

Since μ=105 and σ=20 we have:

P ( X<137 )=P ( X−μ<137−105 )= P(X−μ/ σ< 137−105/20 )

Since x−μ/σ=Z and 137−105/20=1.6 we have:

P (X<137)=P (Z<1.6)

<u>Step 3: </u>

Use the standard normal table to conclude that:

P (Z<1.6)=0.9452

∴ probability that a randomly selected adult has an IQ less than 137 is 0.9452.

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$\bf \displaystyle \int\limits_{1}^{e}\cfrac{1}{t}\cdot dt\\\\
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\textit{doing substitution}\\\\
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