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4 years ago

What is standard form

Mathematics

2 answers:

natta225 [31]4 years ago

3 0

Answer:

Standard Form. more ... A general term meaning "written down in the way most commonly accepted" It depends on the subject: • For numbers it means "Expanded Form" (such as 125 = 100+20+5), but in Britain it means "Scientific Notation"

Step-by-step explanation:

galina1969 [7]4 years ago

3 0

Answer:

A standard form is a way of writing a long number shorter.

Step-by-step explanation: Here's an example 10 to the third power =1000, so 4 x 10 to the third power 4000. So 4000 can also be written as 4 x 10 with a little 3 at the top. PLEASE MARK THIS BRAINLIEST!!!!!!

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Hannah purchased three items at the store for $7.05, $8.12, and $3.97. She paid for

vichka [17]

Answer:

She should receive $30.86

Step-by-step explanation:

$7.05 + $8.12 + $3.97 =19.14

50 - 19.14 = 30.86

6 0

3 years ago

Write a formula for a Riemann sum for the function f (x )equals 1089 minus x squared over the interval [0,33].

Mashcka [7]

Answer:

Area of 23958

Step-by-step explanation:

The Riemann sum is just the divide of a area into smaller areas and computing the sum of those areas. It is basically the integral of a function over an interval.

$\int\limits {1089-x^2} \, dx$

over the interval [0,33].

$\int\limits {1089-x^2} \, dx=1089x-(x^3)/3$

evaluate

$=0-1089\cdot{33}-(33^3)/3=35937-11979=23958$

4 0

3 years ago

A population has a standard deviation of 80. A random sample of 400 items from this population is selected. The sample mean is d

Helga [31]

Answer:

$ME= 1.8808 * \frac{80}{\sqrt{400}} =7.5232$

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma =80$ represent the population standard deviation

n=400 represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

Since the Confidence is 0.94 or 94%, the value of $\alpha=0.06$ and $\alpha/2 =0.03$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-NORM.INV(0.03,0,1)".And we see that $z_{\alpha/2}=1.8808$