2 years ago

What is the answer for this plz

1 answer:

Alexxx [7]2 years ago

4 0

I think it’s y = 10x + 10

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ELEN [110]

Answer:

a) The probability of falling in the warranty period is 11.6%.

b) The warranty period need to be 19771 km to ensure that no more than 5 per cent of tires fail in the warranty period.

Step-by-step explanation:

a) To fall within the warranty period, the tire has to fail before the 20,000 km.

To calculate the probability, we first calculate the z-value:

$z=\frac{X-\mu}{\sigma}=\frac{20000-20613}{512}= \frac{-613}{512}= -1.197$

Then, the probability of falling in the warranty period is:

$P(X$

b) To calculate this we have to go on from a P(z<z₁)=0.05. This happens for z=-1.645.

This corresponds to a value X of:

$X=\mu+z*\sigma=20613+(-1.645)*512=20613-842=19771$

The warranty period need to be 19771 km to ensure that no more than 5 per cent of tires fail in the warranty period.

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