Write 6.39 repeated as a mixed number in simplest form? please help ASAP !!

According to the manufacturer of a backup UPS device, the normal output voltage is 120 volts. The sample of 40 measured voltage

anyanavicka [17]

Answer:

z = 1.83<1.96

null hypothesis is accepted

The sample is came from a population mean

Step-by-step explanation:

Step :-1

The sample of 40 measured voltage amounts from a unit have a mean of 123.59 volts and a standard deviation of 0.31 volts

given sample size n =40

mean of the sample ×⁻ = 123.59 volts

standard deviation of sample σ = 0.31 volts

Step2:-

Null hypothesis :-

the sample is from a population with a mean equal to 120 volts.

H₀ : μ =120

Alternative hypothesis:-

H₁ : μ ≠120

level of significance:- α =0.05

Step 3:-

The test statistic

$z = \frac{x_{-}-mean }{\frac{S.D}{\sqrt{n} } }$

substitute values and simplification

$z = \frac{123.59-120}{\frac{0.31}{\sqrt{40} } }$

on simplification we get the calculated value

z = 1.83

The tabulated value z =1.96 at 0.05 % level of significance

Conclusion:-

Calculated Z < The tabulated value z =1.96 at 0.05 % level of significance

so the null hypothesis is accepted

The sample is came from a population mean

4 0

3 years ago

HELPPPOOPOPPPP!!!! PLEASE

guajiro [1.7K]

The answer is....................................................

5 0

3 years ago

A new soup recipe contains 33 percent less sodium per serving than the old soup recipe. The old soup recipe contained x milligra

masya89 [10]

Answer:

The expressions that could represent the amount of sodium per serving, in milligrams, in the new soup recipe is a) 0.67x

Step-by-step explanation:

Given:

A new soup recipe contains 33 percent less sodium per serving than the old soup recipe. The old soup recipe contained x milligrams of sodium per serving.

Now, to find the expression that could represent the amount of sodium per serving, in milligrams, in the new soup recipe.

The old soup recipe contained sodium per serving = $x\ milligrams.$

As given, the new soup recipe contains 33 percent less sodium per serving than the old soup recipe.

So, to get the amount of new soup recipe sodium per serving we write an equation:

$x-33\%\ of\ x$

= $x-\frac{33}{100} \times x$

= $x-\frac{33x}{100}$

= $x-0.33x$

= $0.67x.$

Thus, the expression $0.67x$ milligrams represent the amount of sodium per serving in new soup recipe.

Therefore, the expressions that could represent the amount of sodium per serving, in milligrams, in the new soup recipe is a) $0.67x.$

5 0

3 years ago

Three-quarters of the 24 pies at the bakery or pumpkin pie how many pies are pumpkin

Dmitriy789 [7]

3 quarters of 24 is 8
So 8 pies

4 0

3 years ago

What is the value of x? Enter your answer in the box. x =

aleksley [76]

Answer:

8 is your answer for x

Step-by-step explanation:

Note that this is an equilateral triangle, meaning that all of the sides are congruent. This means that all the angel measurements are congruent.

First, divide 180 with 3 (3 because there are 3 angles)

180/3 = 60

Each angle must equal 60. You are solving for x. Set the expression with x as the variable equal to 60

7x + 4 = 60

Isolate the x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First, subtract 4 from both sides.

7x + 4 (-4) = 60 (-4)

7x = 60 - 4

7x = 56

Next, divide 7 from both sides.

(7x)/7 = (56)/7

x = 56/7

x = 8

8 is your answer for x.

~

8 0

3 years ago

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