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3 years ago

Simplify the numerical expression: (15÷3)×2+10

Mathematics

1 answer:

Nostrana [21]3 years ago

4 0

Answer:

20.

Step-by-step explanation:

Using order of operations (PEMDAS):

(15 / 3)*2 + 10

= 5*2 + 10

= 20.

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3 years ago

Which expressionuses the associatice property to make it easier to evaluate 6 (1/3 x 7/5)

ozzi

Answer:

Step-by-step explanation:

6(1/3X7/5)=(6X1/3)X7/5

6X7/15=6/3X7/5

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3 years ago

Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence i

mash [69]

Complete Question

A biologist reports a confidence interval of (3.5,4.9) when estimating the mean height (in centimeters) of a sample of seedlings. What is the estimated margin of error and the sample mean?

Answer:

The margin of error is $E = 0.7$

The sample mean is $\= x = 4.2$

Step-by-step explanation:

from the question we are told that

The upper limit is $k = 4.9$

The lower limit is $r = 3.5$

Generally the margin of error is mathematically represented as

$E = \frac{k - r}{ 2}$

$E = \frac{ 4.9 - 3.5 }{2}$

$E = 0.7$

Generally the sample mean is mathematically evaluated as

$\= x = k - E$

=> $\= x = 4.9 - 0.7$

=> $\= x = 4.2$

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3 years ago

The package of a particular brand of rubber band says that the bands can hold a weight of 7 lbs. Suppose that we suspect this mi

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Answer:

False this value is very likely to find in this distribution

Step-by-step explanation:

With mean 7 ( μ ) and standad deviation (σ ) 2 we can observe, value 6.6 is close to the lower limit of the interval

μ ± 0,5 σ 7 ± 1 in which we should find 68,3 % of all values

(just 6 tenth to the left)

And of course 6.6 is inside the interval

μ ± 1 σ where we find 95.7 % of th value

We conclude this value is not unlikely at all

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