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2 years ago

If 10 sweets cost 130 pounds how much do 13 sweets cost?

Mathematics

2 answers:

olga nikolaevna [1]2 years ago

6 0

Answer:169 pounds

Step-by-step explanation: to find how many pounds one candy would cost, divide the 130 pounds by the initial 10 sweets, you should get 1 sweet equals 13 pounds, so if 1 sweet cost 13 pounds, than multiply the cost of 1 sweet by 13 to get 169 pounds for 13 sweets

Savatey [412]2 years ago

3 0

Answer:169 pounds

Step-by-step explanation:

if 10 sweets=130

then 1 sweet = 130/10 which is 13

so 1 sweet = 13 pounds

13 sweet = 13 sweet multiplied by 13 pounds=169 pounds

so 13 sweet is 169 pounds

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Answer:

Step-by-step explanation:

Sum of 1 through 100 = 100×(1+100)/2

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<em>Convert percentage to fraction by dividing by 100</em>
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2 years ago

A chemist examines 15 geological samples for potassium chloride concentration. The mean potassium chloride concentration for the

NikAS [45]

Answer:

$0.376-2.145\frac{0.0012}{\sqrt{15}}=0.375$

$0.376+2.145\frac{0.0012}{\sqrt{15}}=0.377$

And we are 95% confident that the true mean of chloride concentration is between 0.375 and 0.377 cc/ cubic meter

Step-by-step explanation:

Data provided

$\bar X=0.376$ represent the sample mean for the chloride concentration

$\mu$ population mean (variable of interest)

s=0.0012 represent the sample standard deviation

n=15 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

Since we need to find the critical value first we need to begin finding the degreed of freedom

$df=n-1=15-1=14$

The Confidence is 0.95 or 95%, the significance would be $\alpha=0.05$ and $\alpha/2 =0.025$ , and the critical value for this case with a t distribution with 14 degrees of freedom is $t_{\alpha/2}=2.145$