Answer:
b. 85
Step-by-step explanation:
Average grade (μ) = 75
Standard deviation (σ) = 8
Assuming a normal distribution, the z-score corresponding to the upper 10% of the test grades is z = 1.28.
The minimum grade 'X' within the top 10% is given by:
Rounding to the nearest percent, the dividing point between an A and a B grade is 85.
Answer:
.20
Step-by-step explanation:
It will converge if the common factor r is between 0 and 1.
For example:-
A GS with first term a1 = 2 and d = 1/2, the terms are:-
2 , 1 , 1/2, 1/4, 1/8,1/16 and so on
Each term gets smaller and smaller and they will become very small - close to 0. The sum will converge to a certain value also.
In this case it will converge to 2 /( 1 - 1/2) = 4
If d > 1 the terms will increase without bounds and the sum gets bigger and bigger . The series diverges.
for example 2, 8, 32, 128, 512 .... where a1 = 2 and d = 4.
