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
Oduvanchick [21]
2 years ago
13

IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Using the empirical rule, what percentage

of people have an IQ score between 70 and 130?​
Mathematics
1 answer:
Kobotan [32]2 years ago
4 0

70 = 100 - 2•15 is 2 s.d.'s below the mean.

130 = 100 + 2•15 is 2 s.d.'s above the mean.

By the empirical rule,

Pr [70 ≤ X ≤ 130] = Pr [-2 ≤ Z ≤ 2] ≈ 95%

(where Z is normally distributed with mean 0 and s.d. 1)

You might be interested in
PLS HELPP DETERMINE THE INTERCEPTS OF THE LINE
kondor19780726 [428]

Answer:10-3

2-4

Step-by-step explanation:

8 0
3 years ago
(-3.7)to the power of 5
Nina [5.8K]

Answer:

-693.43957

Step-by-step explanation:

-3.7^5

6 0
3 years ago
On Novermber 27, 1993, the New York times reported that wildlife biologists have found a direct ink between the increase in the
Korolek [52]

Answer:

a.  1 263 888

b. 130 701

c. 72 years

Step-by-step explanation:

a. The differential equation applies here.

Let the quantity increase for a certain time be given by Q(t)

Every unity of time, the quantity increases by 1+\frac{r}{100} so that after the time t, the quantity remaining will be given by:

Q(t) = (1+ \frac{r}{100} )^{t}

In a similar manner, the quantity R(t) decreases at a rate given by the following expression:

1-\frac{r}{100} and after the time , t the quantity of R remaining will be given by:

R(t) = (1-\frac{r}{100} )^{t}

a. To find the population of humans in 1953

Q(t) = (1+ \frac{r}{100} )^{t}

1993 - 1953 = 40 years = t

Q(40) = Q×1.06^{40}

Q = 1 263 888.44

    ≈ 1 263 888

b. For bear population in 1993:

R(t) = (1-\frac{r}{100} )^{t}

t = 40

R(40) = b 0.94^{40} = 11 000

b = 130 700. 889

    ≈130 701

c. time taken for black bear population number less than 100 is given by:

130 = 11000×0.94^{t}

solving using natural logarithms gives t = 72.72666

                                                                  =   72 years Ans

8 0
3 years ago
What is the value of 5(y+3)-3x2 when x=4 and y=2? <br> A. –23 <br> B. –10 <br> C. 10 <br> D. 23
pentagon [3]

Answer:

A !

Step-by-step explanation:

Substitute the value of the variable into the expression and simplify.

Hope this helps!

                                                   -Lei

3 0
2 years ago
Read 2 more answers
I just failed a test cansomeone explained to me what inequalitys are
neonofarm [45]

Answer:

An inequality is a relation which makes a non equal comparison between two of more numbers or other mathematic equations. > I'd greater than < is less than = equal to. ≥ is greater than or equal ≤ less than or equal to. = equal to ≠ not equal

6 0
3 years ago
Read 2 more answers
Other questions:
  • The price of a television before tax is $1625.00. The total price with tax is $1,803.75. What is the rate of the sales tax?
    11·1 answer
  • Clara has a garden that is 7 feet wide and 4 feet long she has 30 tomato plants to put in the garden each plant needs one square
    10·2 answers
  • What is the area of a parallelogram with a base of 8 m and a height of 6 m?
    12·1 answer
  • The answer is is 26, -44, but i dont understand how to solve it. can you explain?
    10·1 answer
  • You need at least 30 cubic feet of sand to fill a sand box. Each box contains 2.5 cubic feet of sand. Write and solve an inequal
    9·1 answer
  • Solve: 6/x + 23 = 1/y for y.
    9·1 answer
  • What is 30x pulse 80x
    11·2 answers
  • Solve for the unknown angles. Justify your answers with steps (do not just provide answers)
    8·1 answer
  • Television sizes are measured on the diagonal Tony's television length is 42 inches and the television width is 31 inches what i
    14·1 answer
  • Evaluate the expression when a=-2 and x=7.<br> -2a+x
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!