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Otrada [13]
3 years ago
11

The concentration of platinum in a necklace is 7%. The necklace weighs 16 g. Find the amount of platinum in the necklace.

Mathematics
1 answer:
Sophie [7]3 years ago
4 0
1.12g of platinum is in the necklace.
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8(C - 9) = 6(20 - 12) - 40​
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A random variable x has a Normal distribution with an unknown mean and a standard deviation of 12. Suppose that we take a random
Zielflug [23.3K]

Answer: The 95% confidence interval for the mean of x is (94.08, 101.92) .

Step-by-step explanation:

We are given that ,

A random variable x has a Normal distribution with an unknown mean and a standard deviation of 12.

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Also, it is given that , Sample mean \overline{x}=98 having sample size : n= 36

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By using the z-value table , the two-tailed critical value for 95% Confidence interval :

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We know that the confidence interval for unknown population mean(\mu) is given by :-

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Substitute all the given values, then the required confidence interval will be :

98\pm (1.96)\dfrac{12}{\sqrt{36}}

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Therefore, the 95% confidence interval for the mean of x is (94.08, 101.92) .

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