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
Anon25 [30]
2 years ago
8

A recent survey found that 7575​% of all adults over 50 wear glasses for driving. In a random sample of 4040 adults over​ 50, wh

at is the mean and standard deviation of those that wear​ glasses? Round the answers to the nearest hundredth.
Mathematics
1 answer:
malfutka [58]2 years ago
5 0

Answer:

Mean = 30

standard Deviation = 2.74

Step-by-step explanation:

Formula

mean = np

Standard Deviation = \sqrt{npq}

from the question = 40

P = 75% or 0.75

q = 1 - p = 1 - 75% or 1 - 0.75

To find mean

mean = 40 x 0.75

           = 30

For Standard Deviation (SD)

Standard Deviation = \sqrt{npq}

       = \sqrt{40 X 0.75 X 0.25

      = \sqrt{7.5}

:. Standard  Deviation       = 2.74

You might be interested in
A package of 24 pencils costs 2.88$. at this rate how much would 30 pencils cost?
ASHA 777 [7]
24➗2.88=0.8 30➗0.8 = 3.75 So the answer is 3.75
6 0
3 years ago
F(n)=3n-15/10 what's the inverse
slavikrds [6]
To find the inverse function, interchange the variables and solve for y.
f^-1(n) = 1/2 + n/3
4 0
3 years ago
Read 2 more answers
What does a irrational number look like
julia-pushkina [17]

A irrational number is a number that can't be expressed as a ratio of two whole numbers. That's it.

For examples (in increasing order of difficulty)

1 is a rational number because it is 1/1

0.75 is a rational number because it is equal to 3/4

2.333... (infinite number of digits, all equal to three) is rational because it is equal to 7/3.

sqrt(2) is not a rational number. This is not completely trivial to show but there are some relatively simple proofs of this fact. It's been known since the greek.

pi is irrational. This is much more complicated and is a result from 19th century.

As you see, there is absolutely no mention of the digits in the definition or in the proofs I presented.

Now the result that you probably hear about and wanted to remember (slightly incorrectly) is that a number is rational if and only if its decimal expansion is eventually periodic. What does it mean ?

Take, 5/700 and write it in decimal expansion. It is 0.0057142857142857.. As you can see the pattern "571428" is repeating in the the digits. That's what it means to have an eventually periodic decimal expansion. The length of the pattern can be anything, but as long as there is a repeating pattern, the number is rational and vice versa.

As a consequence, sqrt(2) does not have a periodic decimal expansion. So it has an infinite number of digits but moreover, the digits do not form any easy repeating pattern.

5 0
2 years ago
Dilate (9, 6) using a scale factor of 1/3
KATRIN_1 [288]
The answer is (3,2)

To get this answer we either...
A) Multiply both coordinates by 1/3
or
B) Divide each coordinate by 3

9*(1/3) = 9/3 = 3
6*(1/3) = 6/3 = 2
6 0
3 years ago
Thanks for helping, I really appreciate it
den301095 [7]

Answer:

a)ΔFHA is similar to ΔZIA by hypotenuse side test.

reason:- angle H and angle I are of 90 degrees.

b) FH/ ZI = HA/ IA = FA/ ZA

angle F = angle Z, angle H = angle I , angle angle A = angle A

The scale factor is 3/2......( HA/IA = 12/8 = 3/2)

c) IZ = 3.3 ....( FH/ IZ = 3/2, 5/ IZ = 3/2, IZ = 10/3 = 3.33)

7 0
3 years ago
Other questions:
  • What is the probability that a family with five children has all five girls?<br>​
    9·1 answer
  • Mr. Rodriguez, a college instructor, can grade his class papers in 3 hours while it takes his assistant 4 1/2 hours. If Mr. Rodr
    11·1 answer
  • Two similarity ratio of two similar polygons is 3:1. find the ratio of their perimeters
    11·2 answers
  • According to the diagram which of the following statement is true?
    14·1 answer
  • How many hundreds makes 1000​
    10·2 answers
  • How do you translate a figure 5 units right and 1 unit up, what are the coordinates ?
    10·2 answers
  • How do you solve: x-27=62<br> I also need the answer
    5·2 answers
  • Four ounces of a certain perfume cost 20$. How much would six ounces of perfume cost?
    7·1 answer
  • Middle school students were asked how they got too school each morning there were 375 students who said they rode the bus.This n
    10·1 answer
  • 2. Factorizar: 3ax – 3ay – 2bx + 2by<br>help please :(
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!