The following are the ages (years) of 5 people in a room:

Mathematics

2 answers:

Maksim231197 [3]3 years ago

6 0

Answer:

the age of the person that entered the room is 37

Step-by-step explanation:

$m=\frac{sum of terms}{number of terms}$

$\frac{x}{6} =21\\$

x=126

12+21+25+18+13=89

126-89=37

aalyn [17]3 years ago

4 0

Answer:

Step-by-step explanation:

(12 + 21 + 25 + 18 + 13 + n) / 6 = 21

(12 + 21 + 25 + 18 + 13 + n) = 126

n = 126 - 12 - 21 - 25 - 18 - 13

n = 37

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A sample of 1500 computer chips revealed that 37% of the chips fail in the first 1000 hours of their use. The company's promotio

andreyandreev [35.5K]

Answer:

$z=\frac{0.37 -0.39}{\sqrt{\frac{0.39(1-0.39)}{1500}}}=-1.59$

Step-by-step explanation:

Data given and notation

n=1500 represent the random sample taken

$\hat p=0.37$ estimated proportion of of chips fail in the first 100 hours

$p_o=0.39$ is the value that we want to test

$\alpha$ represent the significance level

z would represent the statistic (variable of interest)

$p_v$ represent the p value (variable of interest)

Concepts and formulas to use

We need to conduct a hypothesis in order to test the claim that the actual percentage that fail is different from the stated percentage. Find the value of the test statistic.:

Null hypothesis: $p=0.39$

Alternative hypothesis: $p \neq 0.39$

When we conduct a proportion test we need to use the z statisitc, and the is given by:

$z=\frac{\hat p -p_o}{\sqrt{\frac{p_o (1-p_o)}{n}}}$ (1)

The One-Sample Proportion Test is used to assess whether a population proportion $\hat p$ is significantly different from a hypothesized value $p_o$ .