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3 years ago

Show how to find the product of 16.2*4 using addition

Mathematics

2 answers:

Stolb23 [73]3 years ago

7 0

16.2 + 16.2 +16.2 +16.2 = 64.8

Arada [10]3 years ago

6 0

16.2 x 4 = 16.2 + 16.2 + 16.2 + 16.2 = 64.8

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A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1491 and the standard deviati

Alinara [238K]

Answer:

$z(1910)=1.3429\\\\z(1230)=-0.9006\\\\z(2190)=2.2404\\\\z(1380)=-0.3558$

Step-by-step explanation:

-Given the population mean is $\mu=1491$ and the standard deviation is $\sigma=312$ , we calculate the z-scores using the formula:

$z=\frac{\bar x-\mu}{\sigma}$

#The z-score for 1910 can be calculated as:

$z(1910)=\frac{x-\mu}{\sigma}\\\\=\frac{1910-1491}{312}\\\\=\frac{419}{312}\\\\=1.3429$

#The z-score for 1230can be calculated as:

$z(1230)=\frac{x-\mu}{\sigma}\\\\=\frac{1230-1491}{312}\\\\=\frac{-281}{312}\\\\=-0.9006$

#The z-score for 2190 is calculated as follows:

$z(2190)=\frac{x-\mu}{\sigma}\\\\=\frac{2190-1491}{312}\\\\=\frac{699}{312}\\\\=2.2404$

#The z-score for 1380 is calculated as:

$z(1380)=\frac{x-\mu}{\sigma}\\\\=\frac{1380-1491}{312}\\\\=\frac{-111}{312}\\\\=-0.3558$

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3 years ago

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AlekseyPX

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3 years ago

Ling wants to determine the average distance she travels each day in her car. She records the odometer reading, which measures t

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Answer:

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Step-by-step explanation:

Given

$n = 7$ --- days

See attachment for odometer readings

Required

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$Mean = \frac{\sum x}{n}$

So, we have:

$Mean = \frac{10150 + 10211 + 10424 + 10769 + 10884 + 11155 + 11477}{7}$

$Mean = \frac{75070}{7}$

$Mean = 10724.2857143$

Approximate

$Mean = 10724.29\ mi$

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Answer: There is not enough data

Step-by-step explanation:

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Answer:

Step-by-step explanation:

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