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Komok [63]
3 years ago
11

A scientist wants to study the average lifespan of a population of 1000 glow worms. He records the lifespan of a random selectio

n of 60 worms and finds that 20 of them live for 10 months, 15 of them live for 10.5 months, and 25 of them live for 11 months. What is the sample mean of the lifespan of the population of glow worms? Round your answer to the nearest tenth and do not include units.
Mathematics
2 answers:
Nat2105 [25]3 years ago
8 0

Answer: 10.5

With out being rounded it’s 10.5417

Step-by-step explanation:

scoray [572]3 years ago
5 0
75 cuz max was gay really real happy
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Find the x intercept of the parabola with vertex 3,-2 and y intercept 0,7 round to the nearest hundredth
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An x-intercept is namely a "solution" or "zero" or "root" often called, and when that happens, y = 0, just like with any other x-intercept.

\bf ~~~~~~\textit{parabola vertex form}
\\\\
\begin{array}{llll}
\boxed{y=a(x- h)^2+ k}\\\\
x=a(y- k)^2+ h
\end{array}
\qquad\qquad
vertex~~(\stackrel{}{ h},\stackrel{}{ k})\\\\
-------------------------------\\\\
\begin{cases}
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\\\\\\
\textit{we also know that }
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so what is its x-intercept anyway?

\bf \stackrel{y}{0}=(x-3)^2-2\implies 2=(x-3)^2\implies \pm\sqrt{2}=x-3
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\pm\sqrt{2}+3=x\qquad therefore\qquad (\pm\sqrt{2}+3~~~~,~~~~0)
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Step-by-step explanation:

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