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laila [671]
3 years ago
7

4km in9hr, then 24 km in

Mathematics
2 answers:
Mariulka [41]3 years ago
7 0
It is 54 hours
4/9=24/x
4x=216
X=54
Morgarella [4.7K]3 years ago
5 0
If you ran 4km in 9 hours.
Then you'll run 24 km's in.

4km per 9 hours
8km per 18 hours.
12km per 26 hours.
16km per 34 hours.
20km per 40.
24km per 46.
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Nine students took the SAT. Their scores are listed below. Later on, they read a book on test preparation and retook the SAT. Th
SCORPION-xisa [38]

Answer:

t= 0.4933

t ≥ t ( 0.025 ,8 ) = 2.306

Since the calculated value of t= 0.4933 is less than t ( 0.025 ,8 ) = 2.306 therefore we accept the null hypothesis at 5 % significance level . On the basis of this we conclude that the book had no effect on their scores.

Step-by-step explanation:

We state our null and alternative hypotheses as

H0: ud= 0 Ha: ud≠0

The significance level is set at ∝= 0.05

The test statistic under H0 is

t= d`/ sd/√n

which has t distribution with n-1 degrees of freedom

The critical region is t ≥ t ( 0.025 ,8 ) = 2.306

Computations

Student       Scores before      Scores after    Difference           d²

                        reading book                    ( after minus before)

1                          720                   740             20                       400

2                        860                   860              0                           0

3                        850                   840             -10                       100

4                        880                   920             40                       1600

5                        860                   890             30                        900

6                        710                    720              10                         100

7                       850                    840              -10                       100

8                      1200                  1240             40                        1600

<u>9                      950                    970              20                           40</u>

<u>∑                    6930                  8020           140                         4840</u>

d`= ∑d/n= 140/9= 15.566

sd²= 1/8( 4840- 140²/9) = 1/8 (4840 - 2177.778) = 2662.22/8= 332.775

sd= 18.2422

t= 3/ 18.2422/ √9

t= 0.4933

Since the calculated value of t= 0.4933 is less than t ( 0.025 ,8 ) = 2.306 therefore we accept the null hypothesis at 5 % significance level . On the basis of this we conclude that the book had no effect on their scores.

7 0
3 years ago
Please help me on this will give you brainliest
beks73 [17]
Aren’t you supposed to multiply the exponents to where it’s 5^24 ?
7 0
3 years ago
Read 2 more answers
What represents the most accurate estimation of 719-348
s344n2d4d5 [400]
Um..... probably 500 cause  200 less is 300 and 200 more is 700
3 0
3 years ago
National Bank advertises an intrest rate (in decimal form) of 0.12 if your initial investment is 500 and you want to acumalte $9
elena-s [515]

Answer:

It will take 15 years for $500 to yield $900 at an interest rate of 0.12

Step-by-step explanation:

Simple Interest equals Principal times Rate times The time in years,

That is SI = P*R*T

SI is $900

P = $500

R = 0.12

T i.e. Time is unknown

T will be equal to SI divided by P*R

i.e., T = SI/PR

T = $900/$500*0.12 = 900/60

T = 15 years.

Therefore, it will take $500 investment to yield $900 interest in 15 years at an interest rate of 0.12

4 0
4 years ago
If a 12-sided fair die is rolled twice, find the probability that both rolls have a result of 8.
Diano4ka-milaya [45]

Answer:

1 in 144

Step-by-step explanation:

There is one 8 on a 12-sided die, so the probability of rolling an 8 once is \frac{1}{12}.

We are rolling twice, so (\frac{1}{12})^{2} =\frac{1}{144}.

6 0
3 years ago
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