All categories

2 years ago

I need help with this pleaseeee!!

Mathematics

1 answer:

anastassius [24]2 years ago

5 0

Answer:

Step-by-step explanation:

I guessed

You might be interested in

In February, Paul's electric bill was three dollars more then one-half his gas bill. If the electric bill was ninety-two dollars

USPshnik [31]

Answer:

49$

Step-by-step explanation:

7 0

3 years ago

What is the area of a kite in the figure below?

Leto [7]

Answer:

The are is 1,200 cm squared

Step-by-step explanation:

10 * 20 = 200

20 * 50 = 1000

1000 + 200 = 1,200cm squared

Hope this helped! Have a nice day! Plz mark as brainliest!!!

-XxDeathshotxX

5 0

3 years ago

An educational psychologist wishes to know the mean number of words a third grader can read per minute.

Rama09 [41]

Answer: 208.

Step-by-step explanation:

The formula to find the minimum sample size is given by :-

$n= (\dfrac{z^*\times \sigma}{E})^2$ (1)

, where z* = critical z-value (two tailed).

$\sigma$ = Standard deviation ( from prior study ) and E = Margin of error.

As per given , we have

Margin of error : E= 0.29

Confidence level = 85%

Significance level = $\alpha=1-0.85=0.15$

Using z-table , the critical value (two -tailed)= $z^*=z_{\alpha/2}=z_{0.15/2}=z_{0.075}=1.439$

As per previous study , Variance = $\sigma^2=8.41$

$\sigma=\sqrt{8.41}=2.9$

Now, the required minimum sample size = $n= (\dfrac{(1.439)\times (2.9)}{0.29})^2$ [Substitute the values in formula (1)]

$n=(14.39)^2$

$n=207.0721\approx208$ [ Round to the next integer]

Hence, the minimum number of third graders that must be included in a sample = 208.

5 0

3 years ago

Fred bags groceries at a supermarket. on average he fills 24 bags for every four customers;

Furkat [3]

How many bags he uses per customer
6 bags per customer

7 0

2 years ago

If 8,a,b,27 are in geometric sequence, find the value of a and b.

wel

Answer:

a = 12 and b = 18

Step-by-step explanation:

Given that,

8,a,b,27 are in geometric sequence.

For a GP, the nth term is given by :

$a_n=ar^{n-1}$

Put n = 4

$a_4=ar^{4-1}\\\\a_4=ar^3\\\\27=8\times r^3\\\\r^3=\dfrac{27}{8}\\\\r=\dfrac{3}{2}=1.5$

Put n = 2,

$a_2=ar^{2-1}\\\\a=ar\\\\a=8\times 1.5\\\\a=12$

Put n = 3

$a_3=ar^2\\\\=8\times 1.5^2\\\\b =18$

So, the values of a and b is 12 and 18 respectively.

3 0

3 years ago