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gavmur [86]
3 years ago
5

Write and solve a proportion to answer the question. What number a is 70% of 70

Mathematics
1 answer:
MissTica3 years ago
7 0
Percent means parts out of 100
so 70%=70/100


'of' means multiply


we can do
\frac{x}{70}=\frac{70}{100}
that's the prooprtion

solving
\frac{x}{70}=\frac{70}{100}
\frac{x}{70}=\frac{7}{10}
times both sides by 70
x=\frac{490}{10}
x=49

the number is 49
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9.2 An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a sta
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Answer:

765,795 = 96%

Step-by-step explanation:

confidence interval = 0.04  

The Za/2 theorem = 1/2 = 0.04/2 = 0.02= /x = 720z

If ; 0.02 = 2.05  then the interval is 780-2.05 x 40/√30 x 780+2.05 x 30/√30 = 765,795 = 96%

We see 40/ √30 which is found in equation of finding the sample mean at point /x = 720z

σ 40/ n√30 = 7.3029674334 and is simply a fraction of /x 720z

By normal distribution we find

The 96% confidence interval for the population mean of all bulbs = 765,795

As 765, x 1.04 = 795 = 765, 795

To find Sampling mean.

The Sampling Distribution of the Sample Mean. If repeated random samples of a given size n are taken from a population of values for a quantitative variable, where the population mean is μ (mu) and the population standard deviation is σ (sigma) then the mean of all sample means (x-bars) is population mean μ (mu).

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80% 1.28

90% 1.645 (by convention)

95% 1.96

96% 2.05

98% 2.33

99% 2.58

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  see attached

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The range is the vertical extent. The graph shows a minimum at y=-2, which value is in the range. Expressed in interval notation, it is [-2, ∞).

Please note that the "end behavior" of y tends to +∞ in for either direction of x.

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The graph is "increasing" where it has positive slope, for 3 < x. It is "decreasing" where it has negative slope, for x < 3.

The graph is positive where it is above the x-axis. The points on the x-axis are not part of the "positive" interval(s). You will note there are two intervals where the graph is positive. It isn't difficult to find the answer choice that is a union of two intervals.

The graph is negative where hit is below the x-axis. Again, the points at x=1 and x=5 are not part of that interval, so it is expressed using curved brackets.

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3 years ago
¿Me podrían ayudar a realizar este ejercicio? No entiendo mucho de identidades y necesito escribir el procedimiento y resultado.
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Answer:

Step-by-step explanation:

S

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