Ask question

Ask question

All categories

3 years ago

15

Help with this percentage question plz

2 answers:

lyudmila [28]3 years ago

8 0

9 out of the 15 runners completed the time trial between 52.0 and 53.9 seconds so 9/15 is the percentage you are trying to find. If you divide 9 by 15 and then multiply the decimal by 100, you will have your percentage.

Yuri [45]3 years ago

4 0

The answer is 60% because there are 9 people who got in between 52.0 and 53.9 seconds and 15 people total in that chart. We can turn this to a fraction 9/15. When we divide 9 and 15 we get .6 and we multiply that by 100 (percents are out of 100) and we get 60%

You might be interested in

What is the subset of 2/3??

sineoko [7]

It belongs to the rational numbers.

It is the ratio of two integers, 2 and 3.

3 0

3 years ago

In a random sample of 400 residents of Boston, 320 residents indicated that they voted for Obama in the last presidential electi

coldgirl [10]

Answer:

C.I = 0.7608 ≤ p ≤ 0.8392

Step-by-step explanation:

Given that:

Let consider a random sample n = 400 candidates where 320 residents indicated that they voted for Obama

probability $\hat p = \dfrac{320}{400}$

= 0.8

Level of significance ∝ = 100 -95%

= 5%

= 0.05

The objective is to develop a 95% confidence interval estimate for the proportion of all Boston residents who voted for Obama.

The confidence internal can be computed as:

$=\hat p \pm Z_{\alpha/2} \sqrt{\dfrac{ p(1-p)}{n } }$

where;

$Z_{0.05/2}$ = $Z_{0.025}$ = 1.960

SO;

$=0.8 \pm 1.960 \sqrt{\dfrac{ 0.8(1-0.8)}{400 } }$

$=0.8 \pm 1.960 \sqrt{\dfrac{ 0.8(0.2)}{400 } }$

$=0.8 \pm 1.960 \sqrt{\dfrac{ 0.16}{400 } }$

$=0.8 \pm 1.960 \sqrt{4 \times 10^{-4}}$

$=0.8 \pm 1.960 \times 0.02}$

$=0.8 \pm 0.0392$

= 0.8 - 0.0392 OR 0.8 + 0.0392

= 0.7608 OR 0.8392

Thus; C.I = 0.7608 ≤ p ≤ 0.8392

3 0

3 years ago

Write a system of linear equations for the graph below

Oliga [24]

1q+2x-1 liner #1 liner # is 18% one

5 0

3 years ago

Does this graph represent a function? Why or why not?

Dafna1 [17]

A. Yes because it passes the vertical line test

6 0

3 years ago

Read 2 more answers

In a sample of 5000 flips of a fair coin, tails will always come up 2500 times.

rodikova [14]

true or false? no question?

if so

Faults because 50% is based on each time you flip not the total amount

8 0

3 years ago