Answer:
(B) Mean 3 and standard deviation 5
Step-by-step explanation:
Property of mean
The mean of the sum or difference of two random variable R and S is the sum of their means.
μ (R-S) = μ(R) - μ(S)
μ(R-S) = 10 - 7 = 3
Property of standard deviation
The variance of Independent variable R and S is is the sum of their variances. Even when we subtract two random variables, we still add their variances; subtracting two variables increases the overall variability in the outcomes.
σ^2(R-S) = σ^2 (R) + σ^2(S)
= 16 + 9 ( variance = (standard deviation)^2 )
= 25
σ(R-S) = 5
Answer:
Park Q has greatest percentage of pink butterflies.
Step-by-step explanation:
Butterfly Park Survey Park P Q R S
No, of Pink Butterflies 25 35 37 23
Total Number of Butterflies 53 64 75 55
Now we are supposed to find which park had the greatest percentage of pink butterflies
So, Percentage of pink butterflies in park P =
Percentage of pink butterflies in park Q =
Percentage of pink butterflies in park R=
Percentage of pink butterflies in park S=
So, Park Q has greatest percentage of pink butterflies.
So, Option B is true
Hence Park Q has greatest percentage of pink butterflies.
For this case we must solve the following expression:
÷
According to the PEMDAS algebraic order method, we have the following order:
P: Parenthesis
E: Exponents
MD: Multiplication and division
AS: Addition and subtraction
So, we have:
Answer:
Answer:
Step-by-step explanation:
1/3 qdbhpiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiisxbbbbbbbbb
Answer:
Measure of exterior angle of a regular polygon= 360°
No of sides: Sum of exterior angle
---------------------------------
Each interior angle
= 360°÷24
= 15
#
Hence, the regular polygon has 15 sides..