To find the total area cleaned, mult. 4 1/2 ft^2 by 13 (students):
9 ft^2
---------------- * 13 students = 58.5 ft^2
students
Second approach: Rewrite 4 1/2 as 4 + 1/2
and then mult. this result by 13:
13(4 + 1/2) = 52 + 13/2= 52 + 6.5 = 58 1/2 ft^2 (answer)
Answer:
13.36
Step-by-step explanation:
I will first create a table
X. Y. XY. X²
1. 20. 20. 1
2. 24. 48. 4
3. 35. 105. 9
4. 46. 184. 16
5. 67. 335. 25
6. 80. 480. 36
1. 12. 12. 1
2. 34. 68. 4
3. 34. 102. 9
5. 78. 430. 25
ΣX = 32
ΣY = 430
ΣXY = 1744
ΣX² = 130
n = 10
The formula for regression line is given as :
Y = a + bX
a = intercept
b = slope
The question requires us to find b which is the slope.
b = nΣXY-ΣXΣY/nΣX²-(ΣX)²
= 10x1744-32x430/10x130-(32)²
= 17440-13760/1300-1024
= 3680/276
= 13.36
b = 13.36
Answer:
The number of musicians in the school is 3 times the number of athletes
Step-by-step explanation:
Answer:
<h2>the slope m = 3</h2>
Step-by-step explanation:
Look at the picture.
The formula of a slope:
From the graph we have the points (0, 4) and (-2, -2). Substitute:
Total number of people in the sample = 193 + 127 + 96 = 416
Probability of picking 23-30 year old = 92 /416 = 0.2212 ( not including the people who smoke)
Number of people who smoke = 60+35+23 = 118 people
Prob(someone who smokes) = 118/416 = 0.2837
So required probability = 0.2837 + 0.2212 = 0.505 (answer)
