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denpristay [2]
3 years ago
11

What is 4- 1 1/4 + 1/2

Mathematics
1 answer:
lozanna [386]3 years ago
3 0

Step-by-step explanation:

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An electrical rm manufactures light bulbs that have a life span that is approximately normally distributed. The population stand
stira [4]

Answer:

The 't' test statistic = 1.46 < 1.69

The test of hypothesis is H 0 :μ = 800 is accepted

A sample of 30 bulbs are found came from average µ= 800

Step-by-step explanation:

Step 1:-

Given population of mean μ = 800

given size of small sample n =30

sample standard deviation 'S' = 45

Mean value of the sample χ = 788

Null hypothesis H_{0} =µ  =800

alternative hypothesis  H_{1} = µ ≠ 800

<u>Step 2</u>:-

The 't' test statistic t =  \frac{x-μ}{\frac{sig}{\sqrt{n} } }

                             t = \frac{788-800}{\frac{45}{\sqrt{30} } }

                       t = \frac{12}{8.215} = 1.4607

<u>Step 3</u>:-

The degrees of freedom γ = n-1 = 30-1 =29

From "t" value from table at 0.05 level of significance ( t = 1.69)

The calculated value t = 1.4607 < 1.69

Therefore The null hypothesis H_{0} ' is accepted.

<u>conclusion</u>:-

A sample of 30 bulbs are came found from average µ= 800

7 0
3 years ago
Uhm can i get a brain dump moment right here(btw i pick a random subject)
kolezko [41]

Answer:

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Step-by-step explanation:

8 0
3 years ago
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Three times a number is at most negative six.<br> 3x5-6<br> O 3x2-6<br> O 3x&lt;-6<br> O 3x&gt;-6
geniusboy [140]
The answer is 9 because you solve it from left to right and 3x5 equals 15, 15 subtracted by 6 equals 9
6 0
3 years ago
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If element X has 78protons, how many electrons does it have
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It would have 78 as well
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Which statement describes the end behavior of the exponential function f(x) = 2x – 3?
Shtirlitz [24]

The correct answer is a. for very high x-values, f(x) moves towards positive infinity.


This can always be determined by two factors.

1) is it linear or something else?

2) Is the lead coefficient positive or negative.


In this case, since the x is not being raised to a power or is not raised to a power itself, we know that there are no asymptotes. That takes care of #1 for us.


As for #2, since the coefficient of x (which is the highest power here) is positive, that means it continues to get bigger. If it were negative it would be the opposite. So, the correct answer is that as x gets bigger, f(x) moves towards positive infinity.

6 0
3 years ago
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