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Mathematics

1 answer:

jenyasd209 [6]3 years ago

4 0

I don’t know I need more detail so I can answer the question

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A family goes grocery shopping every week. in a month the costs of the groceries are $72.42, $91.50, $58.99, and $69.02. 5. what

frozen [14]

1) Mean
The mean is given by the sum of the data divided by the number of data (4, in this case):
$\mu = \frac{1}{N} \sum x_i = \frac{1}{4}(72.42+91.50+58.99+69.02) = \frac{291.93}{4}=72.98 $$

2) Standard deviation
The standard deviation is given by:
$\sigma = \sqrt{ \frac{1}{N} \sum (x_i-\mu)^2 }$
where $\mu$ is the mean, that we already found at point 1), and N=4. Substituting data, we have:
$\sigma = \sqrt{ \frac{1}{4} ((-0.56)^2+(18.52)^2+(-13.99)^2+(-3.96)^2) } =$
$= \sqrt{ \frac{1}{4} (554.71)} = \sqrt{138.68} =11.78 $$

3 0

3 years ago

A photographer is planning to enlarge a photograph by a scale factor of 1:5 . The original photograph has an area of 154 square

Step2247 [10]

Your answer should have been 3850 in^2

1^2/5^2 = 1/25

1/25 = 154/x
1x= 154 (25)
1x/1= 3850/1
x= 3850

8 0

2 years ago

Read 2 more answers

Mpuy each expression. 1) (5p2 – 3) + (2p2 – 3p3)

laila [671]

The anwser is 5x-3 because you remove the parentheses and pair like terms

3 0

2 years ago

X f(x) = x2 + 4x . x2_4

PtichkaEL [24]

The answer is 1/(x+4)
Explanation:
You would factor out the denominator
So,
(X-4)(x+4)=x^2-16
So, x-4/(x+4)(x-4)
Then x-4 cancels each other out from the numerator and denominator
Leaving 1/x+4

6 0

2 years ago

Simplify -4 1/5 (-13 1/10) pls help

oksian1 [2.3K]

Answer:

55 1/50 or 2751/50

Step-by-step explanation:

Convert both expressions to improper form

Make their denominators the same

Multiply the numerators

Simplify the fraction if needed

4 0

2 years ago