The power of a number says how many times to use the number in a multiplication.
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For instance 6 to the power of 2
This means
Which is also equal to 36
Answer:
£223 was the original price
Step-by-step explanation:
35% of original price = £78
1% of original price = £78/35 = £2.23
100% of original price = 2.23 x 100 = £223
and I'm pretty sure you know what that is
To get the variance, start with finding the mean of your data points:
(23 + 19 + 22 + 30 + 28) / 5 = 24.4
Now take each data point and subtract the mean from it, then square that value:
23 - 24.4 = -1.4 * -1.4 = 1.96
19 - 24.4 = -5.4 * -5.4 = 29.16
22 - 24.4 = -2.4 * -2.4 = 5.76
30 - 24.4 = 5.6 * 5.6 = 31.36
28 - 24.4 = 3.6 * 3.6 = 12.96
Now get the average of those new numbers. That is your variance:
(1.96 + 29.16 + 5.76 + 31.36 + 12.96) / 5 = 16.24
The standard deviation will be the square root of the variance:
√(16.24) = 4.0299 (rounded to 4DP)
Answer:
28571/1000
Step-by-step explanation:
r/5 4/7
Cross Multiply to get
r7 and 20
divide both sides by 7
r = 2.8571
Since that is in the thousands place the answer is 28571/1000