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2 years ago

Please help a sister we are struggling!!!

Mathematics

1 answer:

disa [49]2 years ago

6 0

Answer:

i just need the points

Step-by-step explanation:

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luna has $50 when she got to the carnival. after 12 rides, she had $26. what was the price of each ride?

stellarik [79]

Answer:

Step-by-step explanation:

Lets see how much money she spent first.

$50 - $26 = $24

Now that we know she spent $24 we can divide 24 by twelve which will tell us how much each ride costs

24 / 12 = 2

She spent $2 on each ride

8 0

2 years ago

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The metric system is only used in france. please select the best answer from the choices provided t f

faltersainse [42]

FALSE
metric system is known as the SI or sytem international system
it is used everywhere except for those few who cling to the english system (USA and UK)

8 0

2 years ago

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I NEED HELP WITH EXPANDED FORM. THE NUMBER IS 96,902,123 . CAN YOU HELP ME?

EastWind [94]

It is 90,000,000+6,000,000+900,000+2,000+100+20+3

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3 years ago

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.A set of 15 tiles is labeled 1 through 15 . Suppose you choose one tile at random.Find the probability of Each event

Andrei [34K]

A) P (8)=1/15
B)P (7 or 11)=2/15
C)P (less than 20)=15/15
D)P (odd number)=8/15
E)P (multiple of 3)=5/15
F)P (35)=0/15

6 0

2 years ago

A research engineer for a tire manufacturer is investigating tire life for a new rubber compound. She has built 10 tires and tes

n200080 [17]

Answer:

The standard deviation of tire life does exceed 3000 km

Step-by-step explanation:

This is a Chi-Square Hypothesis Test for the Standard Deviation, here we have

$\bf H_0: \sigma = 3000$

$\bf H_a: \sigma > 3000$

so, this is an upper one-tailed test.

The <em>test statistic</em> is

$\bf T=\frac{(n-1)s^2}{\sigma^2}$

where

<em>n = 10 is the sample size</em>

<em>s = sample standard deviation</em>

$\bf \sigma$ = population standard deviation

we would reject the null hypothesis if

$\bf T>\chi^2_{(\alpha,n-1)}$

where

$\bf \chi^2_{(\alpha,n-1)}$

is the critical value corresponding to the level of significance $\bf \alpha$ with n-1 degrees of freedom.

we can use either a table or a spreadsheet to compute this value.

In Excel use

CHISQ.INV(0.05,9)

In OpenOffice Calc use

CHISQINV(0.05;9)

and we get this value equals 3.3251

Working out our T statistic

$\bf T=\frac{(n-1)s^2}{\sigma^2}=\frac{9*(2990)^2}{(3000)^2}=8.9401$

Since T > 3.3251 we reject the null and conclude that the standard deviation of tire life exceeds 3000 km.

7 0

3 years ago