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2 years ago

12

in a rock concert ,2/7 of spectators purchased 1000rs tickets while remaining 15000 purchased 500rs tickets. how many spectators

viewed the concert

2 answers:

sweet-ann [11.9K]2 years ago

8 0

[tex]15000= \frac{5}{7}*x[\tex]
[tex]x=15000* \frac{7}{5}=21,000[\tex]

Check 21,000 * 2/7 = 6.000 and 6,000 + 15,000 = 21,000

forsale [732]2 years ago

4 0

2/7 purchased 1000...therefore, 5/7 purchases 500...and 5/7 is 15000 people.
so 5/7 of what = 15000
5/7x = 15000
x = 15000 * 7/5
x = 105000/5
x = 21000 people viewed the concert

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$Inter\ Quartile\ Range = 6.75$

$Variance = 20.44$

$Standard\ Deviation = 4.52$

Step-by-step explanation:

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From the given data;

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Where

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<em />

<em>Start by arranging the data in ascending order</em>

1, 3, 4, 5, 6, 9, 9, 10, 12, 17

N = Number of data; N = 10

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Calculating Q3

$Q_3 = \frac{3}{4}(N+1) th\ item$

<em>Substitute 10 for N</em>

$Q_3 = \frac{3}{4}(10+1) th\ item$

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$Q_3 = \frac{33}{4} th\ item$

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$Q_3 = (8 + 0.25) th\ item$

$Q_3 = 8th\ item + 0.25 th\ item$

Express 0.25 as fraction

$Q_3 = 8th\ item +\frac{1}{4} th\ item$

$Q_3 = 8th\ item +\frac{1}{4} (9th\ item - 8th\ item)$

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$Q_1 = 3 .75$

---------------------------------------------------------------------------------

Recall that

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$IQR = 10.5 - 3.75$

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Calculating Standard Deviation (SD)

$SD = \sqrt{Variance}$

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2 years ago

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