Select the expression that has a value of 15.

Mathematics

1 answer:

lorasvet [3.4K]2 years ago

4 0

Answer:

Second option

Step-by-step explanation:

We will use the process of elimination to find the answer:

<u>First option:</u>
$4+(8\times4)\div6+7$
$8\times4=32$
$4+32\div6+7$
$4+32=36$
$36\div6+7$
$36\div6=6$
$6+7=13$
$=13$

<u>Second option:</u>
$(4+8)\times4\div6+7$
$4+8=12$
$12\times4\div6+7$
$12\times4=48$
$48\div6+7$
$48\div6=8$
$8+7=15$
$=15$

Which means your answer is the second option or "4 + (8 × 4) ÷ 6 + 7."

Hope this helps.

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A jar contains 30 red marbles 50 blue marbles and 20 white marbles what is the the theoretical probability of choosing a white m

svlad2 [7]

Theoretical probablity=desiredoutcomes/totalpossibleoutcomes

desired=number of white marbles=20
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so theoretical probablity=20/100=2/10=0.2=20%

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3 years ago

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The weight of laboratory grasshoppers follows a Normal distribution, with a mean of 90 grams and a standard deviation of 2 grams

JulsSmile [24]

Answer:

95.44% of the grasshoppers weigh between 86 grams and 94 grams.

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 90 grams and a standard deviation of 2 grams.

This means that $\mu = 90, \sigma = 2$