X/y=x/y
10/4=1/y
y=4/10=0.4
In 2005 Mary had 10 stamps in her collection
Answer: 1. True 2. False
Step-by-step explanation: In question 1 they both equal 0.25 (5/20 and 7/28) but in question 2 they equal different values. 11/22=0.5 and 13/25 = 0.52.
X+5x+6=0
x+5x=6x
6x+6=0
-6 -6
6x=-6
\6. /6
x= -1
so the answer would be -1
Answer:

Step-by-step explanation:
Given

----- variance
------------ sample
Required
Determine the S.E
The estimated standard error (S.E) for the sample mean is calculated using the following formula:

Where




So:




Hence: the estimated standard error for the sample mean is 2