A. there are 20 boys and 30 girls.
B.
68.7 out of 100 Boys
Girls im not sure, maybe someone else can answer that sorry
Hope I'm right and this helps sorry i didn't get girls.


____________________________________



[ log (x) + log (y) = log (xy) ]








The only possible value of x is 3, since we can't operate logarithm with a negative integer in it.

Answered by : ❝ AǫᴜᴀWɪᴢ ❞
The brainliest please ................,,,,,,..,,,,,,,,,,,,,,,,,,,
MArishka [77]
Answer:
d
Step-by-step explanation:
1. You convert all the numbers into decimals.
a. For 8 1/9 you multiply 8x9 and add the numerator which in this case is one, so the equation would be 8x9=72 then 72+1= 73
b. For 81/10 I used a calculator for accuracy and I just divided 81 by 10 because the fraction line can also be used as a division sign. For this I got 8.1
2. Now I looked at all the numbers I had including the fractions I converted to decimals... 8.115, 8.55, 73, and 8.1
3. Lastly, I put the numbers in order from least to greatest: 8.1, 8.115, 8.55, and 73
4. In order to figure out which one is the smallest and largest, I just added zeros on the end of the numbers so they would all be the same: 8.1-->8.100, 8.115 I kept the same because it already had 3 decimal places, 8.55--> 8.550, and 73--> 73.000
5. Then i could tell which number was the largest by the decimal place numbers.
**Hope this was helpful... It's kind of hard to explain online but hopefully you have a better understanding of how to do it!**
Sample standard deviation
Mean of data = 84.4
Calculate deviations from the mean = 23.4, 17.8, 3.4, 1.4, -2.6, -3.6, -4.6, -5.6, -13.6 and -15.6
Squaring these deviations; we get 547.56, 316.84, 11.56, 1.96, 6.76, 12.96, 21.15, 31.36, 184.96, 243.36
Adding these we get 1378.47
As its a sample Std Dev we divide by 10 - 1 = 9. For the popklation Std Dev we divide by the number of scores (10).
Std Deviation for sample = sqrt ( 1378.47 / 9) = 12.4 to nearest tenth (answer)
Population Std Dev = sqrt (1378.47 / 10) = 11.7 answer
Theres a lot of arithmetic there so hope i haven't slipped up anywhere!