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3 years ago

34% of 149? Solve and explain. Thanks!

Mathematics

1 answer:

lilavasa [31]3 years ago

4 0

58.11 i got that answer by dividing 39 by 149

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Trials in an experiment with a polygraph include 97 results that include 23 cases of wrong results and 74 cases of correct resul

o-na [289]

Answer:

H0:p= 0.80 H1: p< 0.80 one tailed test

Step-by-step explanation:

We state the null and alternative hypotheses as that the results are 80 % against the claim that the results are less than 80%.

H0:p= 0.80 H1: p< 0.80 one tailed test

p2= 0.8 , p1= 74/97= 0.763

q1= 1-0.763= 0.237 q2= 0.2

The level of significance is 0.05 .

The Z∝= ±1.645 for ∝= 0.05

The test statistic used here is

Z= p1-p2/ √pq/n

Putting the values:

Z= 0.763 -0.8 / √ 0.8*0.2/97

z= -0.037/ 0.0406

z= -0.9113

The Z∝ = ±1.645 for ∝= 0.05 for one tailed test.

As the calculated value does not fall in the critical region we fail to reject the null hypothesis. There is not sufficient evidence to support the claim that such polygraph results are correct less than 80% of the time.

Using the normal probability table.

P (Z < -0.9113)= 1- P(z= 0.9311) = 1- 0.8238= 0.1762

If P- value is smaller than the significance level reject H0.

0.1762> 0.005 Fail to reject H0.

8 0

4 years ago

Which expression is equivalent to 64x3 – 343?

kolezko [41]

(4x – 7)(16x^2 + 28x + 49) is equivalen to 64x3 - 343!

6 0

3 years ago

Read 2 more answers

A bag contains 5 blue marbles 3 yellow marbles and 2 red marbles whats the probability of drawing blue marble?

yarga [219]

Answer:

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers

I WILL MAKE BRAINLIEST PLEASE HELP

Umnica [9.8K]

Solution here,

dimentions of is 20 in. by 10 in. by 12 in.

i.e. volume of tank=20×10×12=2400 cu. in.

Again,

the tank holds 10 gallons of water

i.e. 10 gallons of water occupies 2400 cu. in.

so, 1 gallon of water occupies 2400/10 cu.in.

=240 cu.in

5 0

3 years ago

Box A has a volume of 512 cubic meters. Box B is similar to box A. To create Box B, Box A's dimensions were divided by 2. What i

bearhunter [10]

Answer : The volume of box B is $64m^3$

Step-by-step explanation :

Given :

Volume of box A = 512 cubic meter

Let us assumed that the box A and box B are cubes and the dimensions of cube are same i.e, 'a'.

Volume of box A = V = $a\times a\times a=a^3$

As per question,

When dimensions of box A divided by 2 then the volume of box B will be:

Volume of box A = V' = $\frac{a}{2}\times \frac{a}{2}\times \frac{a}{2}=\frac{a^3}{8}$

As the box B is similar to box A. So, the volume of box B will be:

Volume of box B = V' = $\frac{a^3}{8}$

$V'=\frac{a^3}{8}=\frac{V}{8}$

$V'=\frac{512m^3}{8}=64m^3$

Therefore, the volume of box B is $64m^3$

5 0

4 years ago