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Vinvika [58]
3 years ago
9

Please help me with this

Mathematics
2 answers:
Lapatulllka [165]3 years ago
7 0
The person on top is correct good job
Maksim231197 [3]3 years ago
5 0

Answer:

1/3

Step-by-step explanation:

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To answer (a), we will need to find the Z value for 710 hours and 990 hours.

\begin{gathered} For\text{ 710} \\ Z\text{ = }\frac{x-\mu}{\sigma} \\ \text{    = }\frac{710-850}{70} \\ \text{    = -2} \\ p\text{ =0.0228 } \\ For\text{ 990:} \\ Z\text{ = }\frac{990-850}{70} \\ \text{ =2} \\ p\text{ = 0.9772} \end{gathered}\begin{gathered} To\text{ find P \lparen–2 \le Z \le 2\rparen} \\ =\text{ 0.9772 -0.0228} \\ =\text{ 0.9544} \\ =95.44\% \end{gathered}

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1 year ago
Find the value of x.​
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