10. Write an equation to find the value of x.
2 answers:
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Answer:
See Explanation
Step-by-step explanation:
<em>The question has missing details; However, the following explanation will guide.</em>
<em></em>
Represent the boots print with y and the Liz's feet with x
<em>To calculate how much the boot is longer than her feet, we simply get the difference between the length of the boot's print and her feet;</em>
i.e.
<em>Note that her boot print (y) will always be greater than her feet (x)</em>
<em></em>
Take for instance;
The difference will be
Answer:
Mean = 339 hours
Standard deviation = 54 hours
Step-by-step explanation:
We are given that approximately 2.5% of the bulbs have lives exceeding 445 hours
So,P(x>445) = 0.025
P(x<445) =1- 0.025 =0.975
z value for 0.975 is 1.96
Formula :
So,
--A
Now we are given that approximately 16% have lives exceeding 393 hours,
So,P(x>393) = 0.16
P(x<393) =1- 0.16 =0.84
z value for 0.84 is 1
Formula :
So,
---B
Solve A and B
Substitute the value of from B in A
Substitute the value in B
So, mean = 339 hours
Standard deviation = 54 hours