So I just did 3x-20=223
3x=243
x=243/3
x=81
so the answer would be 81
Step-by-step explanation:
here
f(x)=x^2+6
Now
Replacing the value of x
f(3x)=3x^2 +6
Answer:
The standard error in estimating the mean = (0.1 × standard deviation of the distribution)
Step-by-step explanation:
The standard error of the mean, for a sample, σₓ is related to the standard deviation, σ, through the relation
σₓ = σ/(√n)
n = sample size = 100
σₓ = σ/(√100)
σₓ = (σ/10) = 0.1σ
Hence, the standard error in estimating the mean = (0.1 × standard deviation of the distribution)
