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Svetradugi [14.3K]
3 years ago
9

I know I’m asking a lot but please help reeeeeee and idk I just picked random that’s why d is circled

Mathematics
1 answer:
PolarNik [594]3 years ago
7 0

Answer:

D is actually correct

It wouldn't be A or C and in the phrase it says the sum so it is not B so it is D.

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Round to the nearest whole number: 25.41<br> A. 26<br> B. 25.4<br> C. 25.5<br> D. 25
rodikova [14]
B and C cant be it because its not a whole number and it is .4 so it cant go up one making D the only possible choice.
8 0
3 years ago
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A man who moves to a new city sees that there are two routes he could take to work. A neighbor who has lived there a long time t
sergiy2304 [10]

Answer:

0.3 to 2.3 min

Step-by-step explanation:

n1=n2=10

x1=48

x2=49

s1=4

s2=1

Determine the deegres of freedom.

\delta=\frac{(\frac{s_1^2}{n_1}+\frac{s_2^2}{n_2})^2}{\frac{(\frac{s_1^2}{n1})^2}{n_1-1}+\frac{(\frac{s_1^2}{n1})^2}{n_2-1}}=10.14

t=2.037 (student's appendix)

E=t\sgrt(\frac{s_1^2}{n_1}+\frac{s^2_2}{n_2})=1.3

(x_1-x_2)-E=(48-49)-1.3=-2.3

(x_1-x_2)+E=(48-49)+1.3=0.3

We are 95% confident that average commuting time for  rute A is between 0.3 and 2.3 min shorter than for rute B.

5 0
3 years ago
The length of human pregnancies from conception to birth varies according to an approximately normal distribution with a mean of
Varvara68 [4.7K]

Answer:

A) 68.33%

B) (234, 298)

Step-by-step explanation:

We have that the mean is 266 days (m) and the standard deviation is 16 days (sd), so we are asked:

A. P (250 x < 282)

P ((x1 - m) / sd < x < (x2 - m) / sd)

P ((250 - 266) / 16 < x < (282 - 266) / 16)

P (- 1 < z < 1)

P (z < 1) - P (-1 < z)

If we look in the normal distribution table we have to:

P (-1 < z) = 0.1587

P (z < 1) = 0.8413

replacing

0.8413 - 0.1587 = 0.6833

The percentage of pregnancies last between 250 and 282 days is 68.33%

B. We apply the experimental formula of 68-95-99.7

For middle 95% it is:

(m - 2 * sd, m + 2 * sd)

Thus,

m - 2 * sd <x <m + 2 * sd

we replace

266 - 2 * 16 <x <266 + 2 * 16

234 <x <298

That is, the interval would be (234, 298)

6 0
2 years ago
1) In 2010, the continent of South America had a
Westkost [7]

Answer:

4x109

Step-by-step explanation: 4x109=436 and that is the closest to that number.

3 0
3 years ago
HELP ME FAST PLS! I only have like an hour..
Dominik [7]

Answer:

2/10 and 0.2

Step-by-step explanation:

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