Answer:
- 3
Step-by-step explanation:
let n be the number , then
3n + 4 = n - 2 ( subtract n from both sides )
2n + 4 = - 2 ( subtract 4 from both sides )
2n = - 6 ( divide both sides by 2 )
n = - 3
The number is - 3
Answer:
a) 0.25249
b) 0.66575
Step-by-step explanation:
We solve this question using z score formula
= z = (x-μ)/σ, where
x is the raw score
μ is the population mean = 23.2 gallons
σ is the population standard deviation = 2.7 gallons
a) Find the probability that a randomly selected American drinks more than 25 gallons of bottled water in a year.
For x = 25 gallons
z = 25 - 23.2/2.7
z = 0.66667
Probability value from Z-Table:
P(x<25) = 0.74751
P(x>25) = 1 - P(x<25)
1 - 0.74751
= 0.25249
The probability that a randomly selected American drinks more than 25 gallons of bottled water in a year is 0.25249
2) What is the probability that the selected person drinks between 22 and 30 gallons
For x = 22 gallons
z = 22 - 23.2/2.7
z = -0.44444
Probability value from Z-Table:
P(x = 22) = 0.32836
For x = 30 gallons
z = 30 - 23.2/2.7
z =2.51852
Probability value from Z-Table:
P(x = 30) = 0.99411
The probability that the selected person drinks between 22 and 30 gallons is
P(x = 30) - P(x = 22)
= 0.99411 - 0.32836
= 0.66575
Answer:
are u from Nepal I wanna know
Let Natalie be x, and Fred, y.
So based on 1st condition, we get
x + y =43 - Equation 1
â´ x = 43-y - Equation 2
Now based on 2nd condition, we get
44x+y=88
Using x from Equation 2, we get
44(43-y) + y = 88
â´ 44x43 - 44y + y = 88
â´ 1892 -44y + y = 88
â´ -44y + y = 88 - 1892
â´ 43y =1804
â´ y = 1804/43
â´ y = 41.95
Using the value of y in Equation 2
x = 43 - 41.95
â´ x = 1.05
So Natalie is 1.05 yrs and Fred is 41.95 yrs old.
W=-15 I hope this helped.