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Aleonysh [2.5K]
3 years ago
11

sally wants to purchase some school supplies. Notebooks cost $3 and pens cost $2. sally is not allow to purchase more than 12 it

ems. sally know that she will need at least 4 notebooks and at least 5 pens to be prepared for school. define your variables for x and y
Mathematics
2 answers:
garri49 [273]3 years ago
8 0
8y+60x because 4 notebooks that cost 2$ equal 8$ and 5 pens that cost 12$= 60
Nataliya [291]3 years ago
4 0
She would have bought 9 items and that would have cost $22
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Answer:

The minimum guaranteed mileage is  x = 71489.55

Step-by-step explanation:

From the question we are told that

   The mean is  \mu  =  67900

     The standard deviation is  \sigma =  2050

Generally for the probability to be 4% the minimum guaranteed mileage is evaluated as

    P( X  \ge x ) =1-  P( \frac{X - \mu }{\sigma } < \frac{ x -  67900 }{ 2050}  ) = 0.04

\frac{X -\mu}{\sigma }  =  Z (The  \ standardized \  value\  of  \ X )

     P( X  \ge x ) =1-  P( Z

=>  P( X  \ge x ) = P( Z

=>    z = \frac{ x -  67900 }{ 2050}

From the z table, the critical value corresponding to 0.96 to the left of the curve is  

         z = 1.751

So

        1.751 = \frac{ x -  67900 }{ 2050}

=>     x = 71489.55

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