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zheka24 [161]
3 years ago
8

What value of a makes the equation true 3(a+1.5)=-1.5

Mathematics
2 answers:
Mariana [72]3 years ago
7 0
3* (a + 1,5) = - 1,5     [:3
a + 1.5 = - 0,5
a = - 0,5 - 1.5 = -2


S_A_V [24]3 years ago
4 0

Answer:

-2 teehee iready tingzzzz >:)

Step-by-step explanation:

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Bottles of purified water are assumed to contain 250 milliliters of water. There is some variation from bottle to bottle because
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We accept H₀ we don´t have evidence of differences between the information from the sample and the population mean

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From data and excel (or any statistics calculator) we get:

X = 249,6 ml         and       s  1,26 ml

Sample mean and sample standard deviation respectively.

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We have a normal distribution but we dont know the standard deviation of the population. Furthermore we have a two tails test since we are finding if the sample give us evidence of differences ( in both senses ) when we compare them with the amount of water spec ( 250 ml )

Our test hypothesis are: null hypothesis       H₀    X = μ₀

Alternative Hypothesis                                 Hₐ     X ≠ μ₀

We also know that sample size is 8  therefore df  =  8 - 1   df = 7 , with this value and the fact that we are required to test at α = 0,05 ( two tails test)

t = 2,365

Then we evaluate our interval:

X ± t* (s/√n)   ⇒   249,6 ±  2,365 * ( 1,26/√8 )

 249,6 ±  2,365 * (1,26/2,83)  ⇒ 249,6 ±  2,365 *0,45

249,6 ± 1,052

P [ 250,652 ; 248,548]

Then the population mean 250 is inside the interval, therefore we must accept that the bottles have being  fill withing the spec. We accept H₀

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