Answer:
651 is the minimum number of people over age 30 they must include in their sample.
Step-by-step explanation:
We are given the following information:
Confidence level = 90%
Significance level = 10%
Maximum error = 0.09
Variance = 1.96

Formula:

Putting all the values,


651 is the minimum number of people over age 30 they must include in their sample.
Step-by-step explanation: Let the event of getting Country, Rock and roll, Blues be E, E1 , E3 respectively.
P(E1) = No. of favorable outcomes / Total no. of outcomes
= 11/ 11+17+8 = 11/36
P(E2) = 17/36
P(E3) = 8/36 = 4/18 = 2/9
Answer:
C
Step-by-step explanation:
To find the y- intercept let x = 0, hence
y = 0 + 0 - 6 = - 6 ⇒ (0, - 6) ← y- intercept
To find the x- intercepts let y = 0, that is
x² + x - 6 = 0 ← in standard form
(x + 3)(x - 2) = 0 ← in factored form
Equate each factor to zero and solve for x
x + 3 = 0 ⇒ x = - 3
x - 2 = 0 ⇒ x = 2
Hence x- intercepts are (- 3, 0) and (2, 0)