To be honest choice whatever you want but my advice is to choose the LED light bulb.
Answer:
Option C
Step-by-step explanation:
Given
Mean= μ=60
and
Standard Deviation= σ=5
In order to calculate the percentage of students between 55 and 65, we have to calculate z-score for both
z-score for 55=(55-60)/5
=(-5)/5
=-1
The area to the left of z-score -1 is 0.1587
z-score for 65=(65-60)/5
=5/5
=1
The area to the left of z-score 1 is 0.8413
Area between z-scores of 55 and 65=0.8413-0.1587
=0.6826
Converting into percentage
=0.6826*100
=68.26%
Option C is the correct answer ..
The mean is like the average and median is the middle numbers
Arithmetic Sequence
The value of the 93th term of this arithmetic series is -925
Step-by-step explanation:
The first term of the arithmetic term is a = -5
And the common difference is d = a2-a1 = -15 - ( - 5) = -10
So the 93th term if this arithmetic progression is given by
an = a + (n-1) × d
where an is the nth term of the arithmetic progression
so in order to calculate the 93rd term (a93), the value of n = 93
so a93 = -5 + (93-1) × (-10)
a93 = -5 + (-920
)
a93 = -925
Hence the value of the 93th term of this arithmetic series is -925
