Some data have a distribution that is symmetric and bell-shaped, a mean value of 5.5. We know that 95% of the data is between 4.3 and 6.7. Use the 95% rule to find the standard deviation.

The standard deviation σ = 0.6122

Step-by-step explanation:

Explanation:-

Given mean of the Population  = 5.5

we know that 95% of confidence interval of Z-score = 1.96

95% of confidence interval for mean in normal distribution

(μ±Z₀.₉₅σ)

(μ - 1.96σ , μ +1.96σ)

given that 95% of confidence interval between 4.3 and 6.7

μ - 1.96σ = 4.3

5.5 -1.96σ  = 4.3

5.5 - 4.3 = 1.96σ

1.2 = 1.96σ

σ =

The standard deviation σ = 0.6122

answer 1 : option "c"

answer 2 : option "d"

answer 3 : option "b"

answer 4 : option "d"

answer 5 : option "b"

answer 6 : option "a"

answer 7 : option "c"

answer 8 : option "d"

answer 9 : option "c"

answer 10 : option "d"

answer 11 : option "c"

answer 12 option "b"

answer 13 option "c"

answer 14 option "c"

answer 15 option "d"

answer 16 option "a"

answer 17 option "b"

answer 18 option "c"

answer 19 option "a"

answer 20 option "a"

answer 21 option "c"

d