Answer:
I can't understand what you have written and what to find
Answer:
2n - 9
Step-by-step explanation:
Let the number be n. Then "a number multiply by two then subtract 9" yields
2n - 9
Answer:
4.2% = 0.042
Step-by-step explanation:
You need to divide the percentage by 100 to get its equivalent decimal:
100% = 1 because
100 ÷ 100 = 1
Therefore,
4.2% = 0.042 because
4.2 ÷ 100 = 0.042
Hope this helped :)
![[Hello,BrainlyUser]](https://tex.z-dn.net/?f=%5BHello%2CBrainlyUser%5D)
Answer:
$20
Step-by-step explanation:
20% More = Markup
20% = .20
$25 * .20 = 5 ( Markup Price)
$25 - 5 = $20
Hence, last month the cost of the cat was $20.
[CloudBreeze]
The given data is
Scores: 90-99 80-89 70-79 60-69 50-59
Students: 3 7 12 4 4
Because we are to take the middle value for each group.
Therefore the total score is
Sx = 3*94.5 + 7*84.5 + 12*74.5 + 4*64.5 + 4*54.5 = 2245
The number of students is 3+7+12+4+4 = 30
The mean is
m =2245/30 = 74.833
Calculate (Sx - m)²
(Sx - m)² = 3*(94.5-74.833)² + 7*(84.5-74.833)² + 12*(64.5-74.833)²
+ 4*(64.5-74.833)² + 4*(54.5-74.833)² = 3896.7
Calculate the standard deviation
s = √(3896.7/29) = 11.592
Answer:
mean = 74.83
std. deviation = 11.59
