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3 years ago

Please help ASAP give you 20 points and brainiest

Mathematics

1 answer:

GuDViN [60]3 years ago

6 0

Answer:

Total charge= -25

Step-by-step explanation:

Given :

Charges of some ions

Aluminium +3

Phosphate -3

Chloride -1

Silver +1

To find total charge on 8 phosphate,7 chloride and 2 Aluminium atoms

Aluminium +3 × 2 =+6

Phosphate -3 × 8 = -24

Chloride -1 × 7 = -7

total charge=

+6-24-7 =+6 -31

= -25

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const2013 [10]

Answer:

$\bar x = 82$

$\sigma = 9.64$

Step-by-step explanation:

Given

$n = 12$

$87\ 91\ 86\ 82\ 72\ 91\ 60\ 77\ 80\ 79\ 83\ 96$

Solving (a); Point estimate of mean

To do this, we simply calculate the sample mean

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

$\bar x = \frac{87+ 91+ 86+ 82+72+91+60+77+80+79+83+96}{12}$

$\bar x = \frac{984}{12}$

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Solving (b); Point estimate of standard deviation

To do this, we simply calculate the sample standard deviation

$\sigma = \sqrt{\frac{\sum(x-\bar x)^2}{n - 1}$

$\sigma = \sqrt\frac{(87-82)^2+ (91-82)^2+ ....+ (79-82)^2+ (83-82)^2+ (96-82)^2}{12-1}$

$\sigma = \sqrt\frac{1022}{11}$

$\sigma = \sqrt{92.91}$

$\sigma = 9.64$

Note that: The sample mean and the sample standard deviation are the best point estimators for the mean and the standard deviation, respectively.

Hence, the need to solve for sample mean and sample standard deviation

3 0

3 years ago

The cubic crystal company has a new crystal cube they want to sell. The packaging manager insists that the cubes be arranged to

Nat2105 [25]

Answer:

Following are the responses to the given question:

Step-by-step explanation:

$height \ \ \ \ \ \ \ Width \ \ \ \ \ \ \ Length\\\\$

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