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
dusya [7]
3 years ago
7

The mean score of a placement exam for entrance into a math class is​ 80, with a standard deviation of 10. Use the empirical rul

e to find the percentage of scores that lie between 60 and 80.​ (Assume the data set has a​ bell-shaped distribution.)
Mathematics
1 answer:
Sedbober [7]3 years ago
5 0

Answer:

47.5%

Step-by-step explanation:

You might be interested in
In which of the following equations is x = 3 a true statement?
user100 [1]
They said it was near the bridge
4 0
3 years ago
Find the value of <img src="https://tex.z-dn.net/?f=%246%2B%5Cfrac%7B1%7D%7B2%2B%5Cfrac%7B1%7D%7B6%2B%5Cfrac%7B1%7D%7B2%2B%5Cfra
Paul [167]

Let

x = 6 + \dfrac1{2 + \dfrac1{6 + \dfrac1{2 + \cdots}}}

Then

x = 6 + \dfrac1{2 + \dfrac1x}

and solving for x gives

x = 6 + \dfrac x{2x + 1}

x = \dfrac{13x + 6}{2x + 1}

x(2x+1) = 13x + 6

2x^2 + x = 13x + 6

2x^2 - 12x - 6 = 0

x^2 - 6x - 3 = 0

By the quadratic formula,

x = 3 \pm 2\sqrt{3}

but x must be a positive number, so only the positive square root solution is valid.

x = 3 + 2\sqrt{3}

We identify a = c = 3 and b = 2, so a + b + c = 8.

3 0
3 years ago
Answer this question please and thank you
Levart [38]

Answer:6 pieces

Step-by-step explanation:

Count 2 1/3, (1+1=2 the denomanators are the same so they stay {2/3}) The first two 1/3 is a 2/3 the second two is another and so on

I dont know how to explain it lol

3 0
3 years ago
Read 2 more answers
Help ima mark BRAINLIST
maw [93]

Answer:

40%

Step-by-step explanation:

There are 5 seniors (2+3)

2 of them are males

P ( male given a senior)= male/ senior

                                       2/5

                                     .40

                                      40%

3 0
3 years ago
The difference between one-half a number and the number is 8 find the number
kolbaska11 [484]

Answer:

The number is  48

Step-by-step explanation:

First, let's call the number we are looking for n.

We can then write "two-thirds of the number" as 2/3n

We can also write "one-half of a number" as 1/2n

Finally, we are told 1/2n is the same as 2/3n −8 or: 1/2n = 23n −8  

We can now solve for n: 1/2n − 2/3n = 2/3n −8 − 2/3n 1/2n − 2/3n = −8We next need to get the fractions over common denominators, in this case, 6 by multiplying each fraction by the necessary for of 1: (3/3) 1/2n − (2/2) 2/3n = −8 3/6n − 4/6n = −8 − 1/6n = −8.  

We can finally solve for n by multiplying by -6 to isolate n −6 ⋅(−1/6)n = −8⋅ − 6  

1n = 48

n =48

8 0
3 years ago
Other questions:
  • Please help me find the remainders
    6·1 answer
  • Molly jogged at a rate of 6 miles per hour. what is her rate in feet per second?
    6·2 answers
  • Arrange in order from least to greatest 0.38, 0.3886, 0.3722
    6·2 answers
  • Write down the value of 5 in the following numbers.
    5·1 answer
  • If CP =Rs. 9,000 and SP= Rs. 8,584 then Profit / loss amount is
    11·1 answer
  • Pls help me find the Nth term ASAPP <br><br> Will Give BRAINLIEST!
    15·2 answers
  • A sidewalk has an area that can be represented by the expression (8x + 24) feet. List 3 possible lengths and widths of the sidew
    7·1 answer
  • for what value of the variable is the value of the expression -3(2x+1) is 20 greater than the expression 8x+5
    9·1 answer
  • Find the measure of each angle indicated.
    14·1 answer
  • (Giving 70 points! Also brainly, if it isnt a good answer it gets reported!)
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!