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Reika [66]
3 years ago
8

Winston would like to buy a chalkboard with the original price of $80 which coupon should he use 50% off any chalkboard or a cou

pon 50% off any item ​
Mathematics
2 answers:
Alex777 [14]3 years ago
6 0

Answer:

He can use any, it has the same discount

Step-by-step explanation:

Svetlanka [38]3 years ago
4 0

Answer:

50% off any chalk board

Step-by-step explanation:

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The mean life of a particular brand of light bulb is 1200 hours. if you know that at about 95% of this brand of bulbs will last
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<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
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4 0
3 years ago
From an aeroplane vertically above a straight horizontal plane, the angles of depression of two consecutive kilometres stones on
Airida [17]
You have to build the triangles.

They are such that:
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4 0
3 years ago
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