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gayaneshka [121]
3 years ago
14

On a normal distribution of iq test scores, with a mean of 100 and a stadard deviation of 15 points, a score of 70 would place y

ou in approximately what percentile of the population?
Mathematics
1 answer:
Romashka-Z-Leto [24]3 years ago
4 0
(70 -100)/15 = -2 . . . . the z-score of a score of 70

p(z < -2) ≈ 2.3%

A score of 70 would place you in approximately the 2nd percentile.
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A square kitchen tile has sides that are 7inches long. What is the tiles perimeter
Kamila [148]

Answer: 28 Inches

Step-by-step explanation:

First draw a square for this. Since the kitchen tile is a square, we only need one side of the shape which in this case it 7in. Then you take this number and input it on all sides. You should have 7in on all sides. Next you write this equation: 7+7+7+7 or 7x4. This will then give you the answer 28. So, the perimeter of the kitchen tile is 28 inches.

4 0
3 years ago
3) Suppose you deposit $10,000 in a savings account that pays interest at an annual rate of 5%
jeyben [28]

9514 1404 393

Answer:

  3.67 years

Step-by-step explanation:

The amount is found using the compound interest formula.

  A = P(1 +r/n)^(nt)

for principal P invested at annual rate r compounded n times per year for t years.

We can solve this for t:

  A/P = (1 +r/n)^(nt) . . . . divide by P

  log(A/P) = (nt)log(1 +r/n) . . . . take the logarithm

  t = log(A/P)/(n·log(1 +r/n)) . . . . divide by the coefficient of t

Filling in the given values, we find ...

  t = log(12000/10000)/(4·log(1 +0.05/4)) ≈ 3.6692

It will take about 3.67 years for the balance to reach $12,000.

8 0
2 years ago
Read 2 more answers
What is the surface area of the cube?<br><br><br> cube with edge length = 4.5 m
Zarrin [17]
Surface are of a cube = 6a^2

surface area
= 6 (4.5)^2
= 6 x 81 /4
= 243/2
= 121.5
7 0
3 years ago
Given: 3x &lt; 3.
poizon [28]

Answer:

Divide 3 on both sides to get x < 1

Step-by-step explanation:

Hope this helps :)

5 0
2 years ago
a culture started with 5,000 bacteria. after 5 hours, it grew to 6,500 bacteria. predict how many bacteria will be present after
Anastasy [175]
A=pe^rt ,,, 6500=5000e^(5r),,, Solve for r,,, R=(log(6,500÷5,000)÷log(e))÷5,,, R=0.05247 --------- A=5,000×e^(0.05247×16),,, A=11,576.28,,,
6 0
3 years ago
Read 2 more answers
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