All categories

3 years ago

Help I need done ASAP

Mathematics

1 answer:

lora16 [44]3 years ago

3 0

Answer:

3/15 5/25 9/45

Step-by-step explanation:

If you look at 12/60 and simplify it you will get 1/5. Now you just have to apply this to the rest.

You might be interested in

David gained 16 pounds over the winter. he went on a diet and lost 25 pounds. then he regained 4 pounds and weighed 177 pounds.

Alex787 [66]

Let x be the weight of David so

x+16-25+4 = 177

x-5=177

x= 177+5= 182 pound

8 0

3 years ago

a consumer magazine counts the number of tissues per box in a random sample of 15 boxes of No- Rasp facial tissues. The sample s

Alex

Answer:

95% confidence interval for the population variance of the number of tissues per box is [5043.11 , 23401.31].

Step-by-step explanation:

We are given that a consumer magazine counts the number of tissues per box in a random sample of 15 boxes of No- Rasp facial tissues. The sample standard deviation of the number of tissues per box is 97.

Firstly, the pivotal quantity for 95% confidence interval for the population variance is given by;

P.Q. = $\frac{(n-1)s^{2} }{\sigma^{2} }$ ~ $\chi^{2}__n_-_1$

where, $s^{2}$ = sample variance = $97^{2}$ = 9409

n = sample of boxes = 15

$\sigma^{2}$ = population variance

Here for constructing 95% confidence interval we have used chi-square test statistics.

So, 95% confidence interval for the population variance, $\sigma^{2}$ is ;

P(5.629 < $\chi^{2}__1_4$ < 26.12) = 0.95 {As the critical value of chi-square at 14

degree of freedom are 5.629 & 26.12}

P(5.629 < $\frac{(n-1)s^{2} }{\sigma^{2} }$ < 26.12) = 0.95

P( $\frac{5.629 }{(n-1)s^{2} }$ < $\frac{1}{\sigma^{2} }$ < $\frac{26.12 }{(n-1)s^{2} }$ ) = 0.95

P( $\frac{(n-1)s^{2} }{26.12 }$ < $\sigma^{2}$ < $\frac{(n-1)s^{2} }{5.629 }$ ) = 0.95

95% confidence interval for $\sigma^{2}$ = [ $\frac{(n-1)s^{2} }{26.12 }$ , $\frac{(n-1)s^{2} }{5.629 }$ ]

= [ $\frac{14 \times 9409 }{26.12 }$ , $\frac{14 \times 9409 }{5.629 }$ ]

= [5043.11 , 23401.31]

Therefore, 95% confidence interval for the population variance of the number of tissues per box is [5043.11 , 23401.31].

6 0

3 years ago

The tax rate is 8.5% What is the tax on 95$? Round to the nearest hundredth

Natali [406]

Tax = 8.5% x $95 = $8.08 (nearest hundredth)

Answer: $8.08

5 0

4 years ago

A cardboard box of 32 in^3 volume with a square base and open top is to be constructed. What is the length of base that will min

stiv31 [10]

Volume = are base*height
32 = x^2*h --> h = 32/x^2

surface area = 4x(32/x^2) + x^2
SA = 128/x + x^2

SA' = -128/x^2 + 2x = 0
2x = 128/x^2
2x^3 = 128
x^3 = 64
x = 4

surface area minimized when length of base is 4 in.

hope this help

6 0

3 years ago

Read 2 more answers

What is 4/7 ÷ 6/9 showing the work

RSB [31]

First flip the second fraction

4/7 divided by 9/6

Next multiply 4 x 9 which is 36

Then multiply 7 x 6 which is 42

Then divide the fraction 36/42

Which since it's not even it would be in decimal form it would be 0.9

5 0

3 years ago

Read 2 more answers