Please help. Could you explan your answer also? thanks

Mathematics

1 answer:

natulia [17]4 years ago

4 0

Answer: Choice B) -4

The lower quartile, also known as Q1 or the first quartile, is the left edge of the box. In this case, that is at -4. We can drop a vertical line from the left edge of the box until we hit -4 on the number line.

Side Note: 25% of the data values are below Q1, while 75% of the data values are above Q1

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Y is inversy proportional to x. When y=7 , x=9 A) work out an equation connecting y and x? B) work out the value of y when x=21

natita [175]

Answer:

see explanation

Step-by-step explanation:

since y is inversely proportional to x the equation relating them is

y = $\frac{k}{x}$ ← k is the constant of proportionality

to find k use the given condition when y = 7, x = 9

k = yx = 7 × 9 = 63

y = $\frac{63}{x}$ ← is the equation connecting them

when x = 21, then

y = $\frac{63}{21}$ = 3

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