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Mice21 [21]
3 years ago
15

A fuel injection system is designed to last 18 years, with a standard deviation of 1.4 years. What is the probability that a fue

l injection system will last less than 15 years? 25% 33% 2% 20%
Mathematics
2 answers:
choli [55]3 years ago
7 0

Answer:

2%

Step-by-step explanation:

We are given;

Standard Design mean; μ = 18

Sample design mean; x¯ = 15

Standard Standaed deviation; σ = 1.4

Let's find the test statistic from the formula;

z = (x¯ - μ)/σ

Thus;

z = (15 - 18)/1.4

z = -2.14

From the z-table attached, the p-value at z = -2.14 is 0.01618

Thus,

P(X < 15) = 0.01618

Converting to percentage, we have

P(X < 15) = 1.618%

This is approximately 2%

Dominik [7]3 years ago
3 0

Answer:

2%

Step-by-step explanation:

just took the test

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Answer:

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Step-by-step explanation:

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Zolol [24]

Answer:

The unit rate in miles per hour = <em>1.4 miles/hr</em>

Step-by-step explanation:

Given that:

Distance walked by Boardman family = Two over five of a mile = \frac{2}{5}\ miles

Time taken by Boardman family = Two over seven of an hour = \frac{2}{7}\ hour

To find:

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Putting the values:

\Rightarrow \dfrac{\frac{2}5}{\frac{2}7}\\\Rightarrow \dfrac{7}{5}\\\Rightarrow \bold{1.4\ miles/hr}

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antoniya [11.8K]
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this is the answer 
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Mandarinka [93]
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