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3 years ago

I need help!! thank you in advance

Mathematics

2 answers:

k0ka [10]3 years ago

7 0

Answer:

second pic is your answer

11111nata11111 [884]3 years ago

3 0

Answer:
Second picture

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Make a 10 or 100 to subtract mentally 76-59 =

Darya [45]

I don't understand what you're saying. If you mean rounding, it would be rounded to 80-60, which would equal 20.

6 0

3 years ago

Read 2 more answers

You are interested in finding a 90% confidence interval for the average commute that non-residential students have to their coll

Vlad [161]

Answer:

a) 90 % of confidence interval is determined by

$(x^{-} -t_{\frac{\alpha }{2} } \frac{S}{\sqrt{n} } , x^{-} +t_{\frac{\alpha }{2} } \frac{S}{\sqrt{n} } )$

b) The 90% confidence intervals for the population mean

(13.6572 , 22.3428)

Step-by-step explanation:

Step(i):-

Given data

Non residential college students 25 21 26 6 25 14 26 24 7 10 14

Mean of Non residential college students

x⁻ = ∑x/n

= $\frac{25+21+26+6+25+14+26+24+7+10+14}{11}$

x⁻ = 18

now

Non residential

college students 'x' : 25 21 26 6 25 14 26 24 7 10 14

x - x⁻ : 7 3 8 -12 7 -4 8 6 -11 -8 -4

(x-x⁻)² : 49 9 64 144 49 16 64 36 121 64 16

$s^{2} = \frac{49+9+64+144+49+16+64+36+121+64+16 }{11-1}$

S² = 63.2

S = √63.2 = 7.949

Step(ii):-

The 90% confidence the population mean commute for non-residential college students is between and miles.

$(x^{-} -t_{\frac{\alpha }{2} } \frac{S}{\sqrt{n} } , x^{-} +t_{\frac{\alpha }{2} } \frac{S}{\sqrt{n} } )$

Degrees of freedom

ν =n-1 =11-1 = 10

t $t_{\frac{0.10}{2} } = t_{0.05} = 1.812$

Step(iii):-

The 90% confidence the population mean commute for non-residential college students is between and miles.

$(x^{-} -t_{\frac{\alpha }{2} } \frac{S}{\sqrt{n} } , x^{-} +t_{\frac{\alpha }{2} } \frac{S}{\sqrt{n} } )$

$((18- 1.812 \frac{7.949}{\sqrt{11} } , (18-+1.812 \frac{7.949}{\sqrt{11} })$

(18 - 4.3428 , 18 + 4.3428)

(13.6572 , 22.3428)

Conclusion:-

The 90% confidence the population mean commute for non-residential college students is between and miles.

(13.6572 , 22.3428)

7 0

3 years ago

It is customary to leave a 15% tip for a waiter/waitress. Suppose your meal costs $22.50, What would you tip the wait person? Ho

algol13

Answer:

$25.88

Step-by-step explanation:

Given data

Cost of meal= $22.50

Tip= 15%

Let us find 15% of $22.50

=15/100*22.50

=0.15*22.50

=3.375

Hence the amount you would pay in total is

=3.375+22.5

=$25.88

7 0

3 years ago

Sam’s best friend kisses her 20 times while sam’s BF kisses her 102 times

Fudgin [204]

Answer:

122 times

Step-by-step explanation:

20+102=122

(what is this question lol)

3 0

3 years ago

Read 2 more answers

Add. 3x^2 -5x +1 + 2x^2 +9x -6

g100num [7]

Answer:

=5x^2+4x−5

Step-by-step explanation:

Let's simplify step-by-step.

3x2−5x+1+2x2+9x−6

=3x2+−5x+1+2x2+9x+−6

Combine Like Terms:

=3x2+−5x+1+2x2+9x+−6

=(3x2+2x2)+(−5x+9x)+(1+−6)

=5x2+4x+−5

4 0

2 years ago