I could help you but please send me directions!
Answer:
Step-by-step explanation:
Since the scores of the math test are normally distributed, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = math test scores.
µ = mean score
σ = standard deviation
From the information given,
µ = 76
σ = 5
The probability that a student scored below 65 is expressed as
P(x < 65)
For x = 65
z = (65 - 76)/5 = - 2.2
Looking at the normal distribution table, the probability corresponding to the z score is 0.014
The percentage of students that scored below 65 is
0.014 × 100 = 1.4%
⇒ 4³ × 4⁵
⇒ 4³⁺⁵
⇒ 4⁸
In short, Your Answer would be Option C
Hope this helps!
Answer: a) 0.1216
b) 0.8784
Step-by-step explanation:
Let P(watch) = 0.19 ;
And p(don't watch) = 0.81
Find the probability that none of the households are tuned to Found.
P(none) = (0.81)^10 = 0.1216
Find the probability that at least one household is tuned to Found.
P(at least one) = 1-P(none)
1 - 0.1216 = 0.8784
(-7+2i)(3-5i)
=(2i-7)(-5i+3)
=-10i^2+41i-21.
Hope it help!