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arsen [322]
3 years ago
13

Please provide step by step explanation thanks

Mathematics
2 answers:
Romashka [77]3 years ago
6 0

Answer:

504

Step-by-step explanation:80/100 multiplied by 630

shepuryov [24]3 years ago
3 0

Answer:

Step-by-step explanation:

No. of students who can swim = 80% of 630

=\frac{80}{100}*630=8*63=504

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Will the sign of the product of two negative numbers be negative or positive? Explain your answer.
gogolik [260]

Answer:

A

Step-by-step explanation:

6 0
3 years ago
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Which statement is true of this function?<br><br><br> Help me please !!!!!
kherson [118]

Answer:

AAAAAAAAAAAAAAAAAAAAAAAAAA

Step-by-step explanation:

BECAUSE IT'S AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

6 0
3 years ago
A recent study found that 51 children who watched a commercial for Walker Crisps (potato chips) featuring a long-standing sports
hichkok12 [17]

Answer:

1

The claim is that the mean amount of Walker Crisps eaten was significantly higher for the children who watched the sports celebrity- endorsed Walker Crisps commercial

2

The kind of test to use is a t -test because a t -test is used to check if there is a difference between means of a population

3

t  =  3.054

4

The p-value  is   p-value  =  P(Z >  3.054) = 0.0011291

5

The conclusion is  

There is sufficient evidence to conclude that the mean amount of Walker Crisps eaten was significantly higher for the children who watched the sports celebrity- endorsed Walker Crisps commercial

The test statistics is  

Step-by-step explanation:

From the question we are told that

   The first sample size is  n_1  =  51

    The first sample  mean is \mu_1  =  36

    The second sample size is  n_2  =  41

    The second sample  size is  \mu_2  =  25

     The first standard deviation is  \sigma _1  =  21.4 \  g

    The second standard deviation is  \sigma _2  =  12.8 \  g

  The  level of significance is  \alpha =  0.05

The  null hypothesis is  H_o  :  \mu_1 = \mu_ 2

The  alternative hypothesis is  H_a :  \mu_1 > \mu_2

Generally the test statistics is mathematically represented as

    t  =  \frac{\= x_1 - \= x_2}{ \sqrt{ \frac{s_1^2}{n_1}  + \frac{s_2^2}{n_2}  } }

=>   t  =  \frac{ 36 - 25}{ \sqrt{ \frac{ 21.4^2}{51}  + \frac{ 12.8^2}{41}  } }

=> t  =  3.054

The  p-value is mathematically represented as

     p-value  =  P(Z >  3.054)

Generally from the z table  

             P(Z >  3.054) =  0.0011291

=>   p-value  =  P(Z >  3.054) = 0.0011291

From the values obtained  we see that p-value  < \alpha so  the null hypothesis is rejected

Thus the conclusion is  

  There is sufficient evidence to conclude that the mean amount of Walker Crisps eaten was significantly higher for the children who watched the sports celebrity- endorsed Walker Crisps commercial

5 0
3 years ago
12. Show how to use the Distributive<br> Property to divide 54 by 2 by breaking<br> 54 into 40 + 14.
SOVA2 [1]

Answer:

40/2+14/7=27

Step-by-step explanation:

First I would break it down int 50 + 4 but either way you divide both by two

8 0
3 years ago
If your test increased by 14 points, what percent did you increase if there were 50 questions in total? show work
solmaris [256]
Increase = 14
Total =50
Percentage increase = 14/50 x 100 = 28%
8 0
3 years ago
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