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3 years ago

Li has to read four books from a list of 10 books. how many sets of four books can be made?

2 answers:

7 0

To answer this question, we would use the combination formula which is
nCr, where n is the the number of objects and r is the sample.

So n would be 10, and r would be 4, since that is what we need to group.

10 choose 4 is written 10C4, or C(10,4), and equals 10!/(4!(10-4)!)=10!/(4!6!)=10*9*8*7/(1*2*3*4) = 210

Amiraneli [1.4K]3 years ago

3 0

Answer:210

Step-by-step explanation:

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Based on data collected 5 years ago, a hotel expects that 24% of all guests will request smoking rooms. The hotel suspects that

9966 [12]

Answer:

The calculated value Z = 2.3084 > 1.96 at 5% level of significance

Null hypothesis is rejected

Alternative hypothesis is accepted

The hotel does not expects that 24% of all guests will request smoking rooms

Step-by-step explanation:

Step(i):-

Given the hotel takes a random sample of 223 guests. Out of this sample, 39 guests requested smoking rooms.

Sample proportion

p = x/n = 39/223 = 0.174

Given Population proportion 'P' = 0.24

Given random sample size 'n' = 223

Level of significance ∝ =0.05

The critical value Z₀.₀₅ = 1.96

Null Hypothesis (H₀) : P=0.24

Alternative Hypothesis (H₁) : P≠ 0.24

Step(ii):-

Test statistic

$Z = \frac{p-P}{\sqrt{\frac{PQ}{n} } }$

$Z = \frac{0.174-0.24}{\sqrt{\frac{0.24 X 0.76}{223} } }$

|Z| = | -2.3084|= 2.3084

The calculated value Z = 2.3084 > 1.96 at 5% level of significance

Null hypothesis is rejected

Alternative hypothesis is accepted

The hotel does not expects that 24% of all guests will request smoking rooms

7 0

3 years ago

Solve -4r + 18= 6 I need this equation

schepotkina [342]

The answer I got is R=3

3 0

3 years ago

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Which of the following is a rational number? a)10 b)100 c)1000 d)100000

earnstyle [38]

Answer:

All of the above

Step-by-step explanation:

10, 100, 1000, 100000 all are rational numbers because you can write them as:

10/1 , 100/1, 1000/1, 100000/1

7 0

2 years ago

Subtract 8x + 2 from 4x – 6

Fantom [35]

Answer:

-4x-8

Step-by-step explanation:

First, set them up as (4x-6) - (8x +2).

Then simplify.

4x-6-8x-2

4x-8x-6-2

-4x-8

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3 years ago

Write an equation of the line in slope-intercept form (2,1) and (0,-3)

Snowcat [4.5K]

Answer:

y = 2x - 3

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers