18. Solve the inequality. Show your work. –6b > 42 or 4b > –4

Mathematics

2 answers:

grigory [225]3 years ago

6 0

-6b > 42 = b<-7
or
4b > -4 = b>-1
Hope this helps.

zhenek [66]3 years ago

4 0

Answer:

Divide each term by -6 and then simplify. b < -6

divide each term by 2 and then simplify b > -2

then graph the solution b < -6 and b > -2

Step-by-step explanation:

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8.23 A manufacturing company produces electric insulators. You define the variable of interest as the strength of the insulators

Kitty [74]

Answer:

The 95% confidence interval estimate for the population mean force is (1691, 1755).

Step-by-step explanation:

According to the Central Limit Theorem if we have an unknown population with mean μ and standard deviation σ and appropriately huge random samples (n > 30) are selected from the population with replacement, then the distribution of the sample mean will be approximately normally.

The sample selected here is <em>n</em> = 30.

Thus, the sampling distribution of the sample mean will be normal.

Compute the sample mean and standard deviation as follows:

$\bar x=\frac{1}{n}\sum x=\frac{1}{30}\times 51702=1723.4\\\\s=\sqrt{\frac{1}{n-1}\sum (x-\bar x)^{2}}=\sqrt{\frac{1}{30-1}\times 232561.2}=89.55$