ANSWER
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Ratio of 8th graders to 7th graders = 3 : 2
Let the number of graders be 3x and 2x
Number of 8th graders = 18
So , 3x = 18
x = 18/3 = 6
Number of 7th graders = 2 × 6 = 12
Ratio of 6th graders to 7th graders = 5 : 4
Let the number of graders be 5a and 4a
Number of 7th graders = 12
So , 4a = 12
a = 12/4 = 3
Number of 6th graders = 5×3 = 15 ANS
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#BE BRAINLY
Answer: the answer is 35.1
Step-by-step explanation:
Answer: x= -6 x=6
Step-by-step explanation:
expand the equation so you get (x-6)(x+6) and then set the equal to zero and solve
Answer:
The new depth of the scuba diver is 330 feet below sea level.
Step-by-step explanation:
125 + 205 more below sea level = 330 below sea level
Answer: 
Step-by-step explanation:
The confidence interval for population mean is given by :-
, where 
= Population standard deviation.
n= sample size
= Sample mean
z* = Critical z-value .
Given : 
n= 49
Two-tailed critical value for 95% confidence interval = 
Then, the 95% confidence interval would be :-
Hence, the 95% confidence interval for estimating the population mean 
:
