1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kicyunya [14]
2 years ago
10

Here are five number cards. 2. 5 7 8 9 71 One of the cards is removed and the mean average of the remaining four number cards is

6 Which card was removed? You must show your working. Note: Please make sure your final answer says card ...
​

Mathematics
1 answer:
vovangra [49]2 years ago
7 0

Answer

card number 2

5+7+8+9=24/4=6

Step-by-step explanation:

You might be interested in
Can someone help please!
Tcecarenko [31]

Answer:

7*(1/10)=   the third one

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Number 24 plzzzzzz. I beg you give me or help me with the answers.
Ivan
7and 2 3rds divided by 5 and 3 8ths is more then one
5 0
3 years ago
In a simple random sample of 14001400 young​ people, 9090​% had earned a high school diploma. Complete parts a through d below.
ratelena [41]

Answer:

(a) The standard error is 0.0080.

(b) The margin of error is 1.6%.

(c) The 95% confidence interval for the percentage of all young people who earned a high school diploma is (88.4%, 91.6%).

(d) The percentage of young people who earn high school diplomas has ​increased.

Step-by-step explanation:

Let <em>p</em> = proportion of young people who had earned a high school diploma.

A sample of <em>n</em> = 1400 young people are selected.

The sample proportion of young people who had earned a high school diploma is:

\hat p=0.90

(a)

The standard error for the estimate of the percentage of all young people who earned a high school​ diploma is given by:

SE_{\hat p}=\sqrt{\frac{\hat p(1-\hat p)}{n}}

Compute the standard error value as follows:

SE_{\hat p}=\sqrt{\frac{\hat p(1-\hat p)}{n}}

       =\sqrt{\frac{0.90(1-0.90)}{1400}}\\

       =0.008

Thus, the standard error for the estimate of the percentage of all young people who earned a high school​ diploma is 0.0080.

(b)

The margin of error for (1 - <em>α</em>)% confidence interval for population proportion is:

MOE=z_{\alpha/2}\times SE_{\hat p}

Compute the critical value of <em>z</em> for 95% confidence level as follows:

z_{\alpha/2}=z_{0.05/2}=z_{0.025}=1.96

Compute the margin of error as follows:

MOE=z_{\alpha/2}\times SE_{\hat p}

          =1.96\times 0.0080\\=0.01568\\\approx1.6\%

Thus, the margin of error is 1.6%.

(c)

Compute the 95% confidence interval for population proportion as follows:

CI=\hat p\pm MOE\\=0.90\pm 0.016\\=(0.884, 0.916)\\\approx (88.4\%,\ 91.6\%)

Thus, the 95% confidence interval for the percentage of all young people who earned a high school diploma is (88.4%, 91.6%).

(d)

To test whether the percentage of young people who earn high school diplomas has​ increased, the hypothesis is defined as:

<em>H₀</em>: The percentage of young people who earn high school diplomas has not​ increased, i.e. <em>p</em> = 0.80.

<em>Hₐ</em>: The percentage of young people who earn high school diplomas has not​ increased, i.e. <em>p</em> > 0.80.

Decision rule:

If the 95% confidence interval for proportions consists the null value, i.e. 0.80, then the null hypothesis will not be rejected and vice-versa.

The 95% confidence interval for the percentage of all young people who earned a high school diploma is (88.4%, 91.6%).

The confidence interval does not consist the null value of <em>p</em>, i.e. 0.80.

Thus, the null hypothesis is rejected.

Hence, it can be concluded that the percentage of young people who earn high school diplomas has ​increased.

8 0
3 years ago
I don't remember how to find x please help
alexandr1967 [171]
When a number is next to a variable multiply so you problem really is 2(?)=60
3 0
3 years ago
Which choice shows how to find the least common multiple of 9
Len [333]
Circled numbers are prime factors comment if you need me to clarify anything

4 0
2 years ago
Other questions:
  • Which expressions are equivalent to the one below? Check all that apply.
    10·1 answer
  • ANSWER ASAP!! One bottle of orange juice holds 16 ounces. Adam, Mateo, and Tim will share a bottle of orange juice equally. How
    5·2 answers
  • Kirsten and molly are on a 3-day bike ride.The entire route is 156 miles. On the first day,they bilked 64miles. On the second da
    9·1 answer
  • How much compound interest will $50,000 earn in 10 years at 3.4% APR compounded yearly, providing no deposits or withdrawals are
    12·2 answers
  • Help asap!!! I really need help on this
    8·1 answer
  • Given the function f defined by the formula f(x)=2x+1 find the following
    9·2 answers
  • Nancy sells handcrafted bracelets at a flea market for $7. If her monthly fixed costs are $775 and each bracelet costs her $2.75
    13·1 answer
  • What is the value of s in the equation 3r = 10 5s, when r = 10?
    6·1 answer
  • ALGEBRA By bundling cellular, land line, high-speed Internet
    8·1 answer
  • Please help ASAP due soon pretty easy question just stuck
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!