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alukav5142 [94]
3 years ago
6

A soil supplement that weighs 19 lb contains iron, potassium, and mulch. The supplement contains sixteen times as much mulch as

iron and twice as much potassium as iron. Find the amount of mulch in the soil supplement.
Mathematics
1 answer:
3241004551 [841]3 years ago
7 0
So.. let's say iron (f) plus potassium(k) plus mulch(m) all those quantities added together, whatever they are, add up to 19lbs
thus

f + k + m = 19

there is 16 times more mulch than iron, thus m = 16f
and twice as much as potassium, thus m = 2k

so   \bf f+k+m=19\qquad 
\begin{cases}
f=iron\\
k=potassium\\
m=mulch\\
--------------\\
m=16f\to \frac{m}{16}=\boxed{f}
\\\\
m=2k\to \frac{m}{2}=\boxed{k}
\end{cases}
\\\\\\
\cfrac{m}{16}+\cfrac{m}{2}+m=19

solve for "m", to see how much mulch there is

how much iron?  well, m/16 = f

how much potassium?  well, m/2 = k

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A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is kn
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Answer:

95 percent confidence interval for μ is determined by

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a) be the same

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<u>Step (i)</u>:-

Given data a random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph.

The sample size is n= 121

The mean of the sample x⁻ = 65mph.

The standard deviation of the population is 22 mph

σ = 22mph

<u>Step (ii) :</u>-

Given  The 95 percent confidence interval for μ is determined as

(61.08, 68.92)

we are to reduce the sample size to 100 (other factors remain unchanged) so

given The sample size is n= 100

The mean of the sample x⁻ = 65mph.

The standard deviation of the population is 22 mph

σ = 22mph

<u>Step (iii)</u>:-

95 percent confidence interval for μ is determined by

(x^{-} - 1.96\frac{S.D}{\sqrt{n} } , x^{-} + 1.96 \frac{S.D}{\sqrt{n} } )

(65 - 1.96\frac{22}{\sqrt{100} } , 65 + 1.96 \frac{22}{\sqrt{100} } )

(65 - 4.312 ,65 +4.312)

(60.688 ,  69.312) ≅(61 ,69)

This is similar to (61.08, 68.92) ≅(61 ,69)

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