<span>204
First, lookup a standard normal table and see what the z-score is for 0.025 (one half of 100% - 95%) to allow for equal sized tails. You should find that the z-score is 1.96. That means that 95% of the time, the value should be within 1.96 standard deviations of the mean. Now let's calculate the standard deviation.
800 is 800 - 1200 = -400 to the left of the mean of 1200.
1600 is 1600 - 1200 = 400 to the right of the mean of 1200.
So we are an equal distance of 400 on both sides of the mean. And we know from the z-score of 1.96, that we're 1.96 standard deviations from the mean. So a little division will give us the standard deviation. Which is:
400 / 1.96 = 204.0816327
So the standard deviation of the light bulbs is 204</span>
Answer: b
Step-by-step explanation:
i took test
Let me help you!
What we have right now:
<span>*A 5.25 milliliters container.
</span>*A <span>5.29 milliliters container.
</span>*A <span>5.27 milliliters container.
</span>*A <span>5.23 milliliters container.
</span><span>*Sue's measuring cup that can measure to the nearest tenth of a milliliter.
</span>
What we need to do:
*Find out the least amount of oil after Sue used her measuring cup to measure each oil container.
Solution:
Container A: <span>5.25mL ---> 5.3mL
</span>Container B: 5.29mL ---> 5.3mL
Container C: 5.27mL ---> 5.3mL
Container D: 5.23mL ---> 5.2mL <---- This is what we are looking for!
Therefore, the correct answer and the container which has the least amount of oil is: D. <span>5.23 milliliters container.
I hope this helped you :></span>
Answer:
x + 2y
Step-by-step explanation:
so 3x + 2y - 3x, group the like terms 3x - 3x = x
So x + 2y, i think i did that right
