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3 years ago

9 is 75% of what number?

Mathematics

2 answers:

jek_recluse [69]3 years ago

7 0

Answer:

Step-by-step explanation:

9/3=25%/3

3*4=100%/12

S_A_V [24]3 years ago

5 0

Answer:

Step-by-step explanation:

Let the number be x then

75 % of x = 9

75 / 100 * x = 9

75 x = 900

x = 900/ 75

x = 12

Hope it will help :)

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8.52 The heights of 2-year-old children are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches

sweet [91]

Answer:

Heights of 29.5 and below could be a problem.

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.

The heights of 2-year-old children are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches.

This means that $\mu = 32, \sigma = 1.5$

There may be a problem when a child is in the top or bottom 5% of heights. Determine the heights of 2-year-old children that could be a problem.

Heights at the 5th percentile and below. The 5th percentile is X when Z has a p-value of 0.05, so X when Z = -1.645. Thus

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

$-1.645 = \frac{X - 32}{1.5}$

$X - 32 = -1.645*1.5$

$X = 29.5$

Heights of 29.5 and below could be a problem.

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2 years ago

How do I answer the red question?

KengaRu [80]

Answer: who made this question I think you need to round 250 to the nearest whole number I’m not sure.

Step-by-step explanation:

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3 years ago

Read 2 more answers

In England a persons weight is commonly given in stones. One English stone is equal to 14 pounds. If an English friends tells yo

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3 years ago

Jared made 4 bird houses in 3 days. How many days will it take him to make 28 bird houses.

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4 times 7 = 28

3 times 7 = 21

It will take him 21 days to make 28 bird houses.

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3 years ago

In triangle ABC, AD is a median. FE is a straight line parallel to BC cutting the remaining sides AB at F and AC at E and cuttin

daser333 [38]

Answer:

Step-by-step explanation:

since AD is a median it implies that triangle ABC is bisected to two equal right angled triangle which are ADB and ADC.

FE is parrallel to BC and cuts AB at F and AC at E shows that there are two similar triangles formed which are AFE and ABC.

Recall that ADC is a right angled triangle, ED bisects a right angled triangle the the ADE = $45^{o}$ .

Now, Let FD bisect angle ADB,

then ADF = $45^{o}$ too.

Since AFX is similar to Triangle ABD and that Triangle AEX is similar to Triangle ACD, then EDX is similar to FDX

FDE = ADF + ADE = $90^{o}$

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3 years ago