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blsea [12.9K]
3 years ago
7

What number is 1/4 of 20?​

Mathematics
2 answers:
Alex73 [517]3 years ago
6 0
5 just do 4 divided by 20
ozzi3 years ago
6 0

Answer:

5

Step-by-step explanation:

One way to solve this is making both numbers a fraction. So 1/4 times 20/1. It would be 20/4. Then you can simplify that to 5/1, which also equals 5.

You might be interested in
Two sides of a right triangle measure 7 units and 3 units.
weeeeeb [17]

Answer:

20 units squared

Step-by-step explanation:

Use pythagorean theorem to find third side of triangle

{2}^{2}  + 4 {}^{2}  =  {x}^{2}

4 + 16 =  {20}

Take the sqr root of 20

\sqrt{20}

So the side of the square is sqr root of 20

Area is length x width

The area of a square is 2 times s, where s is the length of one side since a square sides are all equal.

So

\sqrt{20}  \times  \sqrt{20 }  = 20

6 0
3 years ago
Two independent samples of sizes 20 and 30 are randomly selected from two normally distributed populations. Assume that the popu
aleksley [76]

Answer:

b. Student-t with 48 degrees of freedom

Step-by-step explanation:

For this case we need to use a Two Sample t Test: equal variances.

Assumptions

When running a two-sample equal-variance t-test, the basic assumptions are "that the distributions of the two  populations are normal, and that the variances of the two distributions are the same".

Let \bar x and \bar y be the sample means of two sets of data of size n_x and n_y respectively. We assume that the distribution's of x and y are:

x \sim N(\mu_x ,\sigma_x =\sigma)

y \sim N(\mu_y ,\sigma_y=\sigma)

Both are normally distributed but without the variance equal for both populations.

The system of hypothesis can be:

Null hypothesis: \mu_x =\mu_y

Alternative hypothesis: \mu_x \neq \mu_y

We can define the following random variable:

t=\frac{(\bar x -\bar y)-(\mu_x -\mu_y)}{s\sqrt{\frac{1}{n_x}+\frac{1}{n_y}}}

The random variable t is distributed t \sim t_{n_x +n_y -2}, with the degrees of freedom df=n_x +n_y -2= 20+30-2=48

And the pooled variance can be founded with the following formula:

s^2=\frac{(n_x -1)s_x^2 +(n_y-1)s_y^2}{n_x +n_y -2}

So on this case the best answer would be :

b. Student-t with 48 degrees of freedom

5 0
3 years ago
The Sullivans purchased $195.60 worth of school
Sveta_85 [38]

Answer:

$11.74

Step-by-step explanation:

195.60/100 X 6 = 11.736

monetary unit so round to 2dp

11.74

8 0
3 years ago
A relay team of 4 swimmers is to be formed from a swim team with 20 member. How many different relay teams are possible?
Mars2501 [29]
<span>When order does not matter you use what is called n choose k formula

n!/(k!(n-k)!) where n is the number of things to choose from and k is the number of choices made, in this case:

20!/(4!(20-4)!)=4845</span>
5 0
4 years ago
A shirt is on sale for $15.75. This is 15% off the original price. What was the original price of the shirt?
almond37 [142]

Answer

18.53

Step-by-step explanation:

Multiply the 15.75 by the remaining percent of 85% to get 18.53

100-15=85

15.75x85%=18.53

5 0
3 years ago
Read 2 more answers
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