Answer:
7
Step-by-step explanation:
1. Do 49÷7 to get the average of 7
Answer: 0
Step-by-step explanation:
100/4 = 25 because 25x4=100 then 25 is rounded down to 0 because it’s below 50. If it was 60 we would round it up to 100
Answer:
1 is concentric circles
2 is concentric circles, they have same center
3 is congruent circles, they have equal radii
4 is correct
5 is correct
Step-by-step explanation:
Congruent circles are circles of the same size while concentric circles are circles that have same center but different radii. Diameter is the line passing through the center of a circle joining two points on the circumference while radius is the joining the center of the circle to any point on the circumference.
Answer:
Multiple sub-parts. Solving first four
Proportion for who had degress or more, p1 = 271/973 = 0.28
Proportion for who had degress or less, p2 = 195 /526 = 0.37
Now, we use hypothesis testing proportion difference:
p = (271 +195) / (973+526) = 466/1499 = 0.31
SE = sqrt{ p * ( 1 - p ) * [ (1/n1) + (1/n2) ] }
= V0.31 * 0.69 * 0.003
= 0.025
z = (p1 - p2) / SE
= (0.28- 0.37)/0.025 = -3.6
For this z, p-value is 0.0001
Hence we can reject null hypothesis by 99.99% surety
So, C. We have very strong evidence against the null hypothesis.
The appropriate standardized statistic in the context of the study is z = -3.6
The p-value and standardized statistic both lead you to the same conclusion. A. True
Step-by-step explanation:
what's the question ? it does not say.
I assume it is "how many packages of what size were sold ?"
x = number of small packages
y = number of medium packages sold
z = number of large packages sold
x + y + z = 9
7x + 12y + 15z = 86
y = 3z
these are the 3 equations we get out of the question.
we put the third equation into the other two :
x + 3z + z = x + 4z = 9
7x + 12×3z + 15z = 7x + 36z + 15z = 7x + 51z = 86
it of this first equation we get
x = -4z + 9
and putting that into the other equation :
7×(-4z + 9) + 51z = 86
-28z + 63 + 51z = 86
23z = 23
z = 1
y = 3z = 3×1 = 3
x = -4z + 9 = -4×1 + 9 = -4 + 9 = 5
so, 5 small, 3 medium and 1 large packages were sold.
