What is the average of four tenths and five thousandths?

2 answers:

7 0

$(\frac{4}{10}+\frac{5}{1000}):2 = (\frac{400}{1000}+\frac{5}{1000})*\frac{1}{2} =\\ \\=\frac{405}{1000}*\frac{1}{2}=\frac{405}{2000}=\frac{81}{400}= .2025$

Rama09 [41]3 years ago

5 0

Four tenths is expressed as .4
five thousandths is expressed as .005
the sum of these is .405 and divided by 2 (there are two numbers we added), we get .2025, that is the average

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MatroZZZ [7]

Set up a proportion.

$\frac{3~minutes}{2~questions}$ = $\frac{x~minutes}{12~questions}$

Cross multiply.

2x=36
x=12

It would take her 12 minutes.

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Formula for surface area of a cube: 6a² where a=20.

6 x (20)²
6 x 400
= 2400

Surface area: 2400 cm

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Mean absolute deviation: The average distance from each number in the set to the mean of the set.

Mean of the set: $\frac{(3+8+10+12+15)}{5} = \frac{48}{5} = 9.6$

9.6-3=6.6
9.6-8=1.6
10-9.6=0.4
12-9.6=11.4
15-9.6=5.4

Mean of 6.6, 1.6, 0.4, 11.4, and 5.4: $\frac{(6.6+1.6+0.4+11.4+5.4)}{5} = \frac{25.4}{5} = 5.08$