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aksik [14]
3 years ago
14

What is the speed of a wave that has a frequency of 900 HZ and a wavelength of 2.3 m?

Mathematics
1 answer:
Delicious77 [7]3 years ago
5 0

Answer:

2070m/s

Step-by-step explanation:

frequency=900HZ

Wavelength=2.3m

now,

speed of wave= frequency × wavelength =900×2.3

=2070m/s

ANSWER

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

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3 years ago
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In the case of whole numbers, dividing 2 by itself would prove the conjecture false.


2/2 = 1

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