Answer:
H₀: σ = 0.62
H₁: σ ≠ 0.62
Step-by-step explanation:
The null hypothesis is that the standard deviation σ is equal to 0.62.
The alternative hypothesis is that it does not equal 0.62.
1 over nine thousand three hundred seventy five
13^2-5^2=144 find the square root of that which is 12