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4 years ago

What is most likely true about the population of 250 grandparents?

Mathematics

2 answers:

Lady bird [3.3K]4 years ago

6 0

Answer:

Of all adults age 30 and older, 37 percent are grandparents

Step-by-step explanation:

sukhopar [10]4 years ago

4 0

Answer:

more grandparents prefer using a hard copy than a digital copy

Step-by-step explanation:

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ana wants to earn 88 percent in her chemistry class she has one quiz left to take on the first 5 quizzes she received a 74 perce

Alinara [238K]

Answer: 91

Step-by-step explanation: I assume you had a typo and mean what did Ana need on the 5th quiz since you only listed 4 quiz scores.

(74 + 92 + 83 + 100 + x)/5 = 88

(349 + x)/5 = 88

((349 +x)/5) x 5 = 88 x 5

349 + x = 440

x = 440-349

x = 91

4 0

4 years ago

If y=10 and d=126, then what is the value of z?

juin [17]

Answer:26

Step-by-step explanation:

85*2=170

170+64+x=360

234+x=360

x=126

3 0

3 years ago

Suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. How many times would we have to f

STALIN [3.7K]

Answer: b) 84

Step-by-step explanation:

Let p be the prior estimate of the required proportion.

As per given , we have

p =0.5 (The probability of getting heads on a fair coin is 0.5)

Significance level : $\alpha: 1-0.90=0.10\\$

Critical z-value (using z-value table ) : $z_{\alpha/2}=1.645$

Confidence interval width : w= 0.18

Thus , the margin of error : $E=\dfrac{w}{2}=0.09$

Formula to find the sample size ( if prior estimate of proportion is known.):-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

Substitute the values , we get

$n=0.5(1-0.5)(\dfrac{1.645}{0.09})^2$

Simplify ,

$n=83.5192901235\approx84$ [Round of to the next whole number.]

Hence, the number of times we would have to flip the coin =<u>84</u>

hence, the correct answer is b) 84

8 0

3 years ago

HOW can you use models to find volume?

Svetradugi [14.3K]

You can find the dimensions of the model and plug them into the formula for volume (length x width x height)

5 0

4 years ago

Yo i need help please ( if u can’t see the problem zoom in btw ) but fr i need to pass plz help

erastovalidia [21]

Answer:

Given no. of persons owned laptop = 76

Total of no. of students owned + Total of no. of students dont have owned laptop given = 155

No. of students dont have laptops = 155 - 76 = 79

So then the total no. of no laptops = 79 + 17 = 96(ans)

8 0

3 years ago