4x + x - 3-9 + 4x = 6 ??
1 answer:
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Set up a proportion.
= 
Cross multiply.
2x=36
x=12
It would take her 12 minutes.
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Formula for surface area of a cube: 6a² where a=20.
6 x (20)²
6 x 400
= 2400
Surface area: 2400 cm
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Mean absolute deviation: The average distance from each number in the set to the mean of the set.
Mean of the set:
9.6-3=6.6
9.6-8=1.6
10-9.6=0.4
12-9.6=11.4
15-9.6=5.4
Mean of 6.6, 1.6, 0.4, 11.4, and 5.4:
Cross multiply.
2x=36
x=12
It would take her 12 minutes.
-----------------------------------------
Formula for surface area of a cube: 6a² where a=20.
6 x (20)²
6 x 400
= 2400
Surface area: 2400 cm
----------------------------------------------
Mean absolute deviation: The average distance from each number in the set to the mean of the set.
Mean of the set:
9.6-3=6.6
9.6-8=1.6
10-9.6=0.4
12-9.6=11.4
15-9.6=5.4
Mean of 6.6, 1.6, 0.4, 11.4, and 5.4:
Complete Question
A few years ago, people tended to have relatively large CD collections. For students at a large university in the midwest, the mean number of CDs owned was 78 with a standard deviation of 90. To confirm these numbers, a random sample of 120 students from this university was collected and the size of their CD collections recorded. These particular 120 students had a mean CD collection size of 80 CDs. What is the numerical value of the sample mean?
Answer:
Sample Mean
Step-by-step explanation:
From the question we are told that:
Population Mean
Standard deviation
Sample size
Sample Mean
Therefore
The numerical value of the sample mean is
Sample Mean