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
STatiana [176]
3 years ago
15

According to an​ almanac, 70​% of adult smokers started smoking before turning 18 years old. ​(a) if 200 adult smokers are rando

mly​ selected, how many would we expect to have started smoking before turning 18 years​ old? ​(b) would it be unusual to observe 160 smokers who started smoking before turning 18 years old in a random sample of 200 adult​ smokers? why?
Mathematics
1 answer:
Strike441 [17]3 years ago
3 0

Solution: ​(a) if 200 adult smokers are randomly​ selected, how many would we expect to have started smoking before turning 18 years​ old?

Answer: It is expected that in a random sample of 200 adult smokers, 0.70 (200)=140 will have started smoking before turning 18.

​(b) would it be unusual to observe 160 smokers who started smoking before turning 18 years old in a random sample of 200 adult​ smokers? why?

Answer: Yes, it would be unusual to observe 160 smokers who started smoking before turning 18 years old in a random sample of 200 adult​ smokers, because 160 is greater than μ + 2σ

You might be interested in
I need help please helppppppppppppppppppppppp
Marrrta [24]

Given:

A figure of a circle and two secants on the circle from the outside of the circle.

To find:

The measure of angle KLM.

Solution:

According to the intersecting secant theorem, if two secant of a circle intersect each other outside the circle, then the angle formed on the intersection is half of the difference between the intercepted arcs.

Using intersecting secant theorem, we get

\angle KLM=\dfrac{1}{2}(Arc(JON)-Arc(KM))

(3x-4)=\dfrac{1}{2}(271-(x+6))

(3x-4)=\dfrac{1}{2}(271-x-6)

Multiply both sides by 2.

6x-8=265-x

Isolate the variable x.

6x+x=265+8

7x=273

Divide both sides by 7.

x=\dfrac{273}{7}

x=39

Now,

\angle KLM=(3x-4)^\circ

\angle KLM=(3(39)-4)^\circ

\angle KLM=(117-4)^\circ

\angle KLM=113^\circ

Therefore, the measure of angle KLM is 113 degrees.

5 0
3 years ago
HELPPPPP PLEASSEEEEEEE
NikAS [45]
The answer would be A.132 because when you add the corner length to 90 it equals 132
7 0
3 years ago
Find the dimensions of a closed right circular cylindrical can of smallest surface area whose volume is 128pi cm^3
Ratling [72]
The surface area of a cylindrical can is equal to the sum of the area of two circles and the body of the cylinder: 2πr2 + 2πrh. volume is equal to π<span>r2h.

V = </span>π<span>r2h = 128 pi
r2h = 128 
h = 128/r2

A = </span><span>2πr2 + 2πrh
</span>A = 2πr2 + 2πr*(<span>128/r2)
</span>A = 2πr2 + 256 <span>π / r
</span><span>
the optimum dimensions is determined by taking the first derivative and equating to zero.

dA = 4 </span>πr - 256 <span>π /r2 = 0
r = 4 cm
h = 8 cm
</span><span>

</span>
4 0
3 years ago
How would I set up this equation? Thank you
algol [13]
Y + 2 = x, or y + 12 = 2x
5 0
3 years ago
1. write a ratio and a percent for the shaded are
vitfil [10]
D. 3/10 is the answer
4 0
3 years ago
Other questions:
  • M-3&gt;4? With explanation
    11·2 answers
  • How many liters equal 105 cubic centimeters? 10.5 L 1.05 L 1050 L 0.105 L
    5·2 answers
  • Please help me with this problem <br>3.14 = 22/7 and r = 7/4
    14·1 answer
  • : While preparing a large catering order for a fruit salad, Jackie buys 15 apples, 18 oranges and 21 mangoes. All of the fruit i
    11·1 answer
  • Write each mixed number as a fraction and each fraction as a mixed number 4 2/3
    15·1 answer
  • PLEASE ANSWER FAST WILL GIVE BRAINLIEST
    11·1 answer
  • Put the following equation of a line into slope-intercept form, simplifying all fractions. 3y - 40 = 9​
    7·1 answer
  • The harbormaster decides how many trips the ferry needs to make for 37 cars. The ferry can carry 8 cars at a time. What is the b
    14·1 answer
  • 7+3√8<br> please help me
    5·2 answers
  • What is the surface area of the triangular prism shaped toy car ramp
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!