2 years ago

What is 7 1/3 x 2/5? Math

Mathematics

2 answers:

jek_recluse [69]2 years ago

4 0

Answer:

Step-by-step explanation:

you would multiply the fractions

then you would add the hole number

marshall27 [118]2 years ago

4 0

Answer:

2 14/15

Step-by-step explanation:

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Your answer is 62.8

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Calculate the sample standard deviation of data from Question 1<br> 76,45,64,80,92

mash [69]

Answer:

$S.D = 15.98$

Step-by-step explanation:

Given: 76,45,64,80,92

Required: Determine the standard deviation

We start by calculating the mean

$Mean = \frac {\sum x}{n}$

Where x-> 76,45,64,80,92 and n = 5

$Mean = \frac {76+45+64+80+92}{5}$

$Mean = \frac{357}{5}$

$Mean = 71.4$

Subtract Mean (71.4) from each of the given data

$76 - 71.4 = 4.6\\45 - 71.4 = -26.5\\64 - 71.4 = -7.4\\80 - 71.4 = 8.6\\92 - 71.4 = 20.6$

Determine the absolute value of the above result

$|4.6| = 4.6\\|-26.5| = 26.5\\|-7.4| = 7.4\\|8.6| = 8.6\\|20.6| = 20.6$

Square Individual Result

$4.6^2 = 21.16 \\26.5^2 = 702.25\\7.4^2 = 54.76\\8.6^2 = 73.96\\20.6^2 = 424.36$

Calculate the mean of the above result to give the variance

$Mean = \frac {\sum x}{n}$

$Mean = \frac{21.16 + 702.25 + 54.76 + 73.96 + 424.36}{5}\\Mean = \frac{1276.49}{5}\\Mean = 255.298$

Hence, Variance = 255.298

Standard Deviation is calculated by $\sqrt{Var}$

$SD = \sqrt{255.298}$

$S.D = 15.9780474402$

$S.D = 15.98 (Approximated)$

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3 years ago

The students at a school a assembly were divided into 4 equal groups there were 63 students in each group write and solve an equ

MissTica

Answer:

4 x 63 = 252

Step-by-step explanation:

There's 4 groups of 63 students.

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52.22 - 39.58 = 12.64

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3 years ago

Find the exact value. <br>cos225°

Sedaia [141]

Exact form: -square root 2/2 (I don't have a square root symbol)
Decimal form: -0.70710678

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3 years ago

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