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amid [387]
3 years ago
14

What is 16-(-)24+4 and does it equal 44

Mathematics
2 answers:
yarga [219]3 years ago
8 0

Answer:

yes, it equals 44

Step-by-step explanation:

16-(-)24+4=44

wolverine [178]3 years ago
4 0

Answer:

it is 44

Step-by-step explanation:

2 minus's right by each other turn into a plus sign.

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To estimate the mean height μ of male students on your campus,you will measure an SRS of students. You know from government data
nexus9112 [7]

Answer:

a) \sigma = 0.167

b) We need a sample of at least 282 young men.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by

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

This Zscore is how many standard deviations the value of the measure X 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 pvalue, we get the probability that the value of the measure is greater than X.

(a) What standard deviation must x have so that 99.7% of allsamples give an x within one-half inch of μ?

To solve this problem, we use the 68-95-99.7 rule. This rule states that:

68% of the measures are within 1 standard deviation of the mean.

95% of the measures are within 2 standard deviations of the mean.

99.7% of the measures are within 3 standard deviations of the mean.

In this problem, we want 99.7% of all samples give X within one-half inch of \mu. So X - \mu = 0.5 must have Z = 3 and X - \mu = -0.5 must have Z = -3.

So

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

3 = \frac{0.5}{\sigma}

3\sigma = 0.5

\sigma = \frac{0.5}{3}

\sigma = 0.167

(b) How large an SRS do you need to reduce the standard deviationof x to the value you found in part (a)?

You know from government data that heights of young men are approximately Normal with standard deviation about 2.8 inches. This means that \sigma = 2.8

The standard deviation of a sample of n young man is given by the following formula

s = \frac{\sigma}{\sqrt{n}}

We want to have s = 0.167

0.167 = \frac{2.8}{\sqrt{n}}

0.167\sqrt{n} = 2.8

\sqrt{n} = \frac{2.8}{0.167}

\sqrt{n} = 16.77

\sqrt{n}^{2} = 16.77^{2}

n = 281.23

We need a sample of at least 282 young men.

6 0
3 years ago
Tim is planning a rectangular flower garden.The garden will be 106 flowers wide and 19 flowers long he has 2,000 flower does he
ANTONII [103]

Answer:

No

Step-by-step explanation:

Multiply width (106) x length (19) = 2014.  Tim needs 14 more flowers.

6 0
2 years ago
Multiply: 5.13 × 4 ASAP correct answers only pls
balandron [24]

Answer: 20.52

Step-by-step explanation:

Your welcome

4 0
2 years ago
Please help me with this
nikitadnepr [17]
Part a: you would get 3x+4=22
Part b: you would get 6 as your answer
3 0
2 years ago
1. What number decreased by 9 is 25? (0.5 pt)
Blizzard [7]

Answer:

34

Step-by-step explanation:

x - 9 = 25

x=25+9

x=34

4 0
3 years ago
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