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jarptica [38.1K]
2 years ago
13

1. Many Alpine ski centers base their calculations of revenues and profits on the belief that the average skier ski’s four times

a year with a population standard deviation of 2. To investigate this belief a random sample of 63 skiers was drawn and each participant was asked to report the number of times they skied last year. This yielded a mean of 4.84. Can we infer at the 10% significance level that the assumption of ski centers is wrong?
Mathematics
1 answer:
pshichka [43]2 years ago
6 0

Answer:

We cannot infer at the 10% significance level that the assumption of ski centers is wrong

Step-by-step explanation:

The null hypothesis for this question can be stated as  

Null hypothesis H0:  =4  

Alternate hypothesis Ha:  

The test is two tailed

Standard Deviation –  

 = 2

z=(4.84-4)/(2/sqrt(63))

=3.33

Z(0.1/2)=1.645 is less than Z =3.334

Hence, we will reject H0  

Hence, the average growth skier ski’s four times a year is not true  

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Solve 3.5x-2.8=-3.8x-7.2 graphically
pshichka [43]

x= -0.6

The graph is attached in the figure below.

Step-by-step explanation:

Solve 3.5x-2.8=-3.8x-7.2

Simplifying:

3.5x-2.8=-3.8x-7.2

Combining like terms:

3.5x+3.8x=-7.2+2.8\\7.3x=-4.4\\x=\frac{-4.4}{7.3}\\x=-0.6

x= -0.6

The graph is attached in the figure below.

Keywords: Graph the equation

Learn more about Graphing the equation at:

  • brainly.com/question/12967961
  • brainly.com/question/10879401
  • brainly.com/question/3126500

#learnwithBrainly

3 0
3 years ago
Simplify the radical expression. show all your steps. √363- 3√27
HACTEHA [7]
All you have to do is take the square root of 363=11√3  

11√3-3√27
8 0
2 years ago
What number needs to be subtracted from both sides of the equation 40 = 25 + x in order to isolate the variable and solve for x?
SOVA2 [1]

Answer:

x = 15

Step-by-step explanation:

As given, the equation 40 = 25 + x

As on the R.H.S of the equation, there is one constant and a variable x

As to isolate the variable we have to subtract the same constant so that that constant gives 0.

As we have the constant value 25

So, subtract 25 from both side of the equation, we get

40 - 25 = 25 + x - 25

⇒15 = x

∴ we get

x = 15

3 0
2 years ago
Solve this equation by using the look inside method to rewrite the problem <br><br> -81 = 3(5 - 4r)
TEA [102]
-81=3(5-4r)
27=-(5-4r)
27=-5+4r
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Hope my answer helped u :)
4 0
2 years ago
Please help worth 92 points <br> 21-32=
Naya [18.7K]

Answer:

-11

Step-by-step explanation:

Hope this helps!

and if u ment 32-21 it’s 11

6 0
2 years ago
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