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mr_godi [17]
1 year ago
6

A manufacturer of pacemakers wants the standard deviation of the lifetimes of the batteries to be less than 1.8 months. A sample

of 20 batteries had a standard deviation of 1.6 months. Assume the variable is normally distributed. Find the 95% confidence interval of the standard deviation of the batteries. Based on this answer, do you feel that 1.8 months is a reasonable estimate?
Mathematics
1 answer:
kodGreya [7K]1 year ago
3 0

Answer:

Look down my answer↓:

Step-by-step explanation:

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PLEASE HELP!! Calculate the slope of the line passing through the following two points: write your slope as a reduced improper f
Alekssandra [29.7K]

Answer:

1

Step-by-step explanation:

slope formula:

\frac{y_2-y_1}{x_2-x_1}\\\\=\frac{3-(-18)}{2-(-19)}\\=\frac{21}{21}=1

6 0
3 years ago
Read 2 more answers
4, 12, 36, 108, ... <br> write an explicit formula for each sequence
Nesterboy [21]

Answer:

Formula is ×3

Step-by-step explanation:

4×3=12

12×3=36

36×3=108

7 0
2 years ago
Wetlands are important ecosystems for many reasons. Select all that apply.
OlgaM077 [116]

Answer:

A and B

Step-by-step explanation:

the bottom 2 don't make sense

7 0
3 years ago
If cos Θ = square root 2 over 2 and 3 pi over 2 &lt; Θ &lt; 2π, what are the values of sin Θ and tan Θ?
KIM [24]

Answer:

The answer is

sin(\theta)=-\frac{\sqrt{2}}{2}

tan(\theta)=-1

Step-by-step explanation:

we know that

tan(\theta)=\frac{sin(\theta)}{cos(\theta)}

sin^{2}(\theta)+cos^{2}(\theta)=1

In this problem we have

cos(\theta)=\frac{\sqrt{2}}{2}

\frac{3\pi}{2}

so

The angle \theta belong to the third or fourth quadrant

The value of sin(\theta) is negative

Step 1

Find the value of  sin(\theta)

Remember

sin^{2}(\theta)+cos^{2}(\theta)=1

we have

cos(\theta)=\frac{\sqrt{2}}{2}

substitute

sin^{2}(\theta)+(\frac{\sqrt{2}}{2})^{2}=1

sin^{2}(\theta)=1-\frac{1}{2}

sin^{2}(\theta)=\frac{1}{2}

sin(\theta)=-\frac{\sqrt{2}}{2} ------> remember that the value is negative

Step 2

Find the value of tan(\theta)

tan(\theta)=\frac{sin(\theta)}{cos(\theta)}

we have

sin(\theta)=-\frac{\sqrt{2}}{2}

cos(\theta)=\frac{\sqrt{2}}{2}

substitute

tan(\theta)=\frac{-\frac{\sqrt{2}}{2}}{\frac{\sqrt{2}}{2}}

tan(\theta)=-1

8 0
3 years ago
Read 2 more answers
Parsons Bank offers two​ checking-account plans. The No Frills plan charges
7nadin3 [17]

If the number of checks are greater than 25, the Simple Checking plan cost​ less.

We have two checking account plans at Parson's bank.

We have to determine for what number of checks per month will the Simple Checking plan cost​ less.

<h3>What is an Inequality in Mathematics ?</h3>

An inequality is a relation which makes a non-equal comparison between two numbers or other mathematical expressions.

Let for x number of checks per month the simple checking plan cost less.

For No frills plan -

Charge per check - $0.25

Therefore, for x checks, it will cost - $0.25x

For Simple Checking plan -

Fixed monthly charges - $5

Charges per check - $0.50

Therefore - for x checks - $5 + $0.50x

Now - for Simple Checking plan to cost​ less than No frills plan -

5 + 0.05x < 0.25x

5 < 0.25x - 0.05x

5 < 0.2x

x > 25

Hence, if the number of checks are greater than 25, the Simple Checking plan cost​ less.

To solve more questions on Inequalities, visit the link below-

brainly.com/question/4916892

#SPJ1

3 0
1 year ago
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