Answer: C. 541.60 hours
Step-by-step explanation:
Since the lifetime of a 2-volt non-rechargeable battery in constant use has a normal distribution, we would apply the formula for normal distribution which is expressed as
z = (x - µ)/σ
Where
x = lifetime of the batteries.
µ = mean lifetime
σ = standard deviation
From the information given,
µ = 516 hours
σ = 20 hours
Looking at the normal distribution table, the z score corresponding to ninety percent approximately is 1.28
Therefore,
1.28 = (x - 516)/20
Cross multiplying by 20, it becomes
20 × 1.28 = x - 516
25.6 = x - 516
x = 516 + 25.6
x = 541.6
Therefore, Ninety percent of all batteries have a lifetime less than
541.60 hours
Answer:
2304 pens
Step-by-step explanation:
well 16 box with 144 pens in each just multiply to get 2304 pens that he stacked
Answer:
Step-by-step explanation:
6A = 60°
6B = 34°
Answer:
The answer would be C. because it does pass the HS line and the Verticate keeps going.
Answer:
wheres the expression
Step-by-step explanation:
