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3 years ago

Sean answers 4/5 of the questions on a test correctly. If there are 100 questions, how many did he not answer correctly?

Mathematics

2 answers:

Serhud [2]3 years ago

8 0

Convert 4/5 to 80 /100. And you get 20 for the final answer.

DanielleElmas [232]3 years ago

3 0

He would have answered 20 incorrectly.

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Suppose you received a score of 95 out of 100 on exam 1 . The mean was 79 and the standard deviation was 8 . If your score on ex

Schach [20]

Answer:

You did the same on both exams.

Step-by-step explanation:

To compare both the scores, we need to compute the z scores of both the exams and then compare the values. The formula for z-score is:

Z = (X - μ)/σ

Where X = score obtained

μ = mean score

σ = standard deviation

For Exam 1:

Z = (95 - 79)/8

= 16/8

Z = 2

For Exam 2:

Z = (90 - 60)/15

= 30/15

Z = 2

The z-scores for both the tests are same hence the third option is correct i.e. you did the same on both exams.

8 0

3 years ago

Which unit would you use to measure the height of a birds

Mkey [24]

I think that inches would be most common for height but centimeters and feet could also be used.

3 0

3 years ago

The wildflowers at a national park have been decreasing in numbers. There were 1200 wildflowers in the first year that the park

Andreas93 [3]

Answer:

Step-by-step explanation:

We have total 1200 wildflowers in first year that is first term a is 1200

We have to find sigma notation showing the infinite growth of the wildflowers.

$wildflowers=\sum_{i=1}^{\infty }1200(\frac{1}{4})^{i-1}$

Formula for infinite sum of GP is $S_{\infty}=\frac{a}{1-r}$

Here, $a=1200,r=\frac{1}{4}$

On substituting the values in the formula of sum we get:

$S_{\infty}=\frac{1200}{1-\frac{1}{4}}$

On simplification we get:

$S_{\infty}=\frac{1200}{\frac{3}{4}}=1600$

Therefore, total sum of wildflowers 1600.

5 0

3 years ago

Read 2 more answers

Wat is the answer for this question -x2 + 5x + 24.

Helen [10]

Answer:

Step-by-step explanation:

5 0

2 years ago

2. There are 42 persons in a mathematics class, and everyone of them drinks either coffee or grape milk at

Basile [38]

Answer:

1. 8

2. 24

Step-by-step explanation:

The number of persons that drink grape milk only :

18 - 10 = 8

The number of persons that drink coffee :

42 - 8 = 34

The number of persons that drink coffee only :

34 - 10 = 24

5 0

2 years ago