1

Mathematics

1 answer:

natita [175]4 years ago

7 0

Answer:

B and c and also f is the answer

1st Period: Minimum = 60, Lower Quartile = 75, Median = 80, Upper Quartile = 90, Maximum = 98

* Range = 98-60 = 38; *Interquartile Range = 90-75 = 15

2nd Period: Minimum = 70, Lower Quartile = 80, Median = 85, Upper Quartile = 91, Maximum = 95

* Range = 95-70 = 25; *Interquartile Range = 91-70= 21

Correct Answers: B, C, F

B - lowest score was a 60 in first period

C - IQR in 2nd period is 21, which is higher than 15 in first period

F - Approximately 75% (Q1-Q3) of first period scores are higher than 75% (Q1-Q3) of second period.

You might be interested in

Allison paid $297.50 for a new laptop. Last week, the price of the laptop<br> was $350.

Thepotemich [5.8K]

15%

350x0.15=52.5

350-52.5=297.5

4 0

3 years ago

What is the completely simplified equivalent of 2/(5+i)?

Bezzdna [24]

namely, let's rationalize the denominator in the fraction, for which case we'll be using the <u>conjugate</u> of that denominator, so we'll multiply top and bottom by its <u>conjugate</u>.

so the denominator is 5 + i, simply enough, its conjugate is just 5 - i, recall that same/same = 1, thus (5-i)/(5-i) = 1, and any expression multiplied by 1 is just itself, so we're not really changing the fraction per se.

$\bf \cfrac{2}{5+i}\cdot \cfrac{5-i}{5-i}\implies \cfrac{2(5-i)}{\stackrel{\textit{difference of squares}}{(5+i)(5-i)}}\implies \cfrac{2(5-i)}{\stackrel{\textit{recall }i^2=-1}{5^2-i^2}}\implies \cfrac{2(5-i)}{25-(-1)} \\\\\\ \cfrac{2(5-i)}{25+1}\implies \cfrac{2(5-i)}{26}\implies \cfrac{5-i}{13}$