Answer:
0.0548
Step-by-step explanation:
The distribution of life span for a certain type of battery is approximately normal with mean 2.5 hours and standard deviation 0.25 hour.
To find the the probability that a selected battery will have a life span of at most 2.1 hours, we need to first determine the z-score for x=2.1 hours using

We substitute the values to get:

We read read -1.6 from the standard normal distribution table to get:
P(X≤2.1)=0.0548
Answer:
113
Step-by-step explanation:
4x-5=96, 4x = 101, x= 25.25
25.25 * 4 = 101
101 + 12 = 103
Answer:
23 apples
Step-by-step explanation:
1/8 of 40 = 5, 20 percent of 40 is 8. 8+4+5 = 17. 40-17 is 23