All categories

3 years ago

The mean of three numbers is 70. if two of the numbers are 55 and 65 what is the third number

2 answers:

6 0

90
55+65=120
there are 3 numbers and when you divide them it makes 70.
70 x 3 = 210
210 - 120 = 90
55 + 65 + 90 = 210
210 / 3 = 70

Evgesh-ka [11]3 years ago

4 0

I thin the third number would be 90 because if the mean of 3 numbers is 70 then multiply 70 an three and you get 210. Then add 55 and 65 and you get 120.Then do 210-120 and you get 90 so 90 is the third number.

You might be interested in

(2 points) An article in the Washington Post on March 16, 1993 stated that nearly 45 percent of all Americans have brown eyes. A

lara31 [8.8K]

Answer: a) z=1.43

b) 0.1528

Step-by-step explanation:

The given set of hypothesis :

$H_0:p=0.45$

$H_a:p\neq0.45$

Since the alternative hypothesis $H_a$ is two-tailed , so we perform two-tailed test.

Also, it is given that : A random sample of n=76 Americans found 28 with brown eyes.

Sample proportion: $\hat{p}=\dfrac{28}{76}=0.3684$

a) The z-statistic would be :-

$z=\dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}$

$\Rightarrow\ z=\dfrac{0.3684-0.45}{\sqrt{\dfrac{0.45(1-0.45)}{76}}}=-1.4299121397\approx-1.43$

b) P-value for two-tailed test = 2P(Z>|z|)= 2P(z>|-1.43|)

=2P(z>1.43)

=2(1-P(z≤1.43)

=2-2P(z≤1.43)

= 2-2(0.9236)[Using standard z-table]

= 2-1.8472=0.1528

Hence, the P-value of the test= 0.1528

6 0

3 years ago

Below is the table of values of a function. Write the output when the input is n .

stiv31 [10]

9514 1404 393

Answer:

Step-by-step explanation:

We observe that each output is 4 times the corresponding input. Then 4 times n will be ...

Input: n

Output: 4n

3 0

3 years ago

This question has three parts. Answer the parts in order.

Whitepunk [10]

Answer:

Step-by-step explanation:

5 0

3 years ago

The radius of the circle - shaped poster is 9 inches. What is the approximate circumference?

statuscvo [17]

Answer: $56.55inch$

Step-by-step explanation:

Circumference formula: $C = 2\pi r$

$C = 2(3.1416)(9inch)$

$C= 56.55inch$

5 0

3 years ago

Please help!!!!!<br> One third of a number x is no more than 15.

Nitella [24]

Answer:

1/3x is less than or equal to 15

Step-by-step explanation:

assuming you want an equation?

1/3x is less than or equal to 15

its this sign < with line under (srry i don't have the symbol)

7 0

3 years ago