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PilotLPTM [1.2K]
2 years ago
7

7. The lifetime of a certain brand of tires is approximately normally distributed, with a

Mathematics
1 answer:
Aleonysh [2.5K]2 years ago
7 0

Answer:

0.0025551

Step-by-step explanation:

Given that:

Mean (m) = 40000

Standard deviation (s) = 2500

P(x < 33,000) :

USing the relation to obtain the standardized score (Z) :

Z = (x - m) / s

Z = (33000 - 40000) / 2500 = - 2.8

p(Z < -2.8) = 0.0025551 ( Z probability calculator)

Probability of Tyre wagering out before mileage limit is reached = 0.0025551

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3 years ago
Kris and his dad built an ice rink. The area is 74.4 sq meters. The length is 12 meters what is the width
-BARSIC- [3]

Answer:

6.2 meters

Step-by-step explanation:

1) area = l*w

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3 0
2 years ago
Seven tenths of a number plus fourteen is less than forty-nine
zloy xaker [14]
I'm going to assume you need this inequality solved.

First, write it as numbers, not words.

7/10n + 14 < 49

where "n" is the unknown number.

Second, if I were you, I'd change that fraction into a decimal, as it'll make life easier later on.

7/10 = 0.7

Now, solve it like you would any other equation.

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5 0
3 years ago
A television costs $350 before sales tax is applied. The final cost of the television was $378.
lana [24]
To get the answer we can use proportion. We know that 350 its 100% and 378 its 100% + taxes.
350% ------------ 100
378% ------------ x
cross multiply now
350*x=378*100
350x=37800      /:350
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Now we see that taxes its 8%, because final price its 100% + taxes = 108%

7 0
3 years ago
5% tax on $1.50 What us total cost
Ede4ka [16]

Answer:

Step-by-step explanation:

In order to obtain the total amount that Monica was charged you should follow some steps.

How much was the net price? You can obtain this value either by clearing the x:

X * 5% = $1.50

X = $1.50 / 5%

Or by using simple rule of three:

If 5% is $1.50

Then 100% is X

So you obtain = $30

Now you just need to sum The net prices and the taxes

Net + tax = Total Charge

$30 + $1.5 = $31.5

5 0
2 years ago
Read 2 more answers
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