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Sliva [168]
3 years ago
14

Which two numbers add up to -19 and multiply to make 35

Mathematics
1 answer:
iris [78.8K]3 years ago
4 0

x+y = -19
x*y  = 35

x=-19-y
(-19-y)y = 35
y^2 +19y +35 = 0
y = -2.066965626
therefore x=35/y = -16.93303437

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A professor wishes to discover if seniors skip more classes than freshmen. Suppose he knows that freshmen skip 2% of their class
KIM [24]

Answer:

We conclude that seniors skip more than 2% of their classes at 0.01 level of significance.

Step-by-step explanation:

We are given that a professor wishes to discover if seniors skip more classes than freshmen. Suppose he knows that freshmen skip 2% of their classes.

He randomly samples a group of seniors and out of 2521 classes, the group skipped 77.

<u><em /></u>

<u><em>Let p = percentage of seniors who skip their classes.</em></u>

So, Null Hypothesis, H_0 : p \leq 2%   {means that seniors skip less than or equal to 2% of their classes}

Alternate Hypothesis, H_A : p > 2%   {means that seniors skip more than 2% of their classes}

The test statistics that will be used here is <u>One-sample z proportion</u> <u>statistics</u>;

                                   T.S.  = \frac{\hat p-p}{{\sqrt{\frac{\hat p(1-\hat p)}{n} } } } }  ~ N(0,1)

where, \hat p = sample proportion of seniors who skipped their classes = \frac{77}{2521}

           n = sample of classes = 2521

So, <u><em>test statistics</em></u>  =  \frac{\frac{77}{2521} -0.02}{{\sqrt{\frac{\frac{77}{2521}(1-\frac{77}{2521})}{2521} } } } }

                               =  3.08

The value of the test statistics is 3.08.

Now at 0.01 significance level, <u>the z table gives critical value of 2.3263 for right-tailed test</u>. Since our test statistics is more than the critical value of z as 2.3263 < 3.08, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which <u>we reject our null hypothesis</u>.

Therefore, we conclude that seniors skip more than 2% of their classes.

6 0
3 years ago
Find two numbers whose difference is 154 and whose product is a minimum.
Serggg [28]
Y - x = 154
let z = xy = x(154 + x) = x^2 + 154x

we need to find the minimum value of z

z' =   2x + 154  which = zero for minm or maxm value

x = -77   and y = 154 -77 = 77

so the 2 numbers are -77 and 77




7 0
3 years ago
HELP PLEASE DUE IN 3 MINUTES
Arisa [49]
Answer: 6

Steps:
7 + 11 + 0 = 18
18/3 = 6
3 0
3 years ago
Read 2 more answers
A triangle has an angle that measures 115°. The other two angles are in a ratio of 2:11. What are the measures of those two angl
schepotkina [342]
One angle of a triangle is 115 degrees.
The sum of the remaining angles is therefore 180-115=65&deg;
If they are in a ratio of 2:11, then the smaller angle is 65*(2/(2+11))=10&deg;
the larger angle is 65*(11/(2+11))=55&deg;.
Check: 10+55=65&deg;=180-115&deg;  ok.
Answer: the measures of the remaining angles are 10 and 55&deg;

4 0
3 years ago
Who here watches haikyuu im bo.red and wanna talk about something
gtnhenbr [62]

Answer:

we can talk if you want, and i watch haikyuu too lol (and more animes)

Step-by-step explanation:

6 0
2 years ago
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