Answer:4
Step-by-step explanation:
Let a denotes the no of odd ball selected and b denotes the no of even ball selected
then
for
for
for
for
thus X can take 4 values i.e. 9,10,11 and 12
Answer:
31 cm
Step-by-step explanation:
The area (A) of a trapezium is calculated as
A = h (a + b)
where h is the height and a, b the bases
Here A = 162, h = 6 and a = 23 , then
× 6 (23 + b) = 162
3(23 + b) = 162 ( divide both sides by 3 )
23 + b = 54 ( subtract 23 from both sides )
b = 31
The other base is 31 cm
Answer:
0.8% or 80%
Step-by-step explanation:
24/30 is equivalent to 80/100
80/100 as a decimal is 80%
hope this helps :3
if it did pls mark brainliest
Let x and y equal our two numbers, then add them and set them equal to 27
x+y=27
Pick a variable to represent your larger number, then make an equation for it
y=2x+6
Substitute your equation for that variable back into the original equation so you get everything in terms of one variable.
x+2x+6=27
Solve!
3x+6=27
3x=21
x=7
Plug x back into the equation:
7+y=21
y=14
Answer:
range is between 294.32 and 227.68 expect the middle 95% of most pregnancies
Step-by-step explanation:
Given data
mean μ = 261 days
standard deviation SD = 17 days
most pregnancies = 95%
to find out
In what range expect to find the middle 95% of most pregnancies
solution
we have Z value for 95% is 1.96
so Confidence interval = mean +/- 1.96×SD
put vale
Confidence interval = 261 +/- 1.96(17)
Confidence interval = 294.32 and 227.68
range is between 294.32 and 227.68 expect the middle 95% of most pregnancies