Answer: B, 7
Step-by-step explanation: Mean is adding all numbers then dividing so 4 + 6 + 6 + 7 + 7 + 8 + 8 + 8 + 9 is 63 and then divide it by the total numbers (9)
63 divided by 9 is 7
7 is the mean, or B
Answer:
84%.
Step-by-step explanation:
Let X be the time in minutes for a student chosen at random to finish the test. .
The probability that a student chosen at random finishes the test in less than 48 minutes will represented as
.
<h3>Method 1: technology</h3>
Evaluate the cumulative normal probability on a calculator, where
- The lower bound is 0,
- The upper bound is 48,
- The mean ,
- The standard deviation
.
<h3>Method 2: z-score table</h3>
.
.
Look up the entry that corresponds to on a z-score table: 0.8413.
In other words,
.
Answer:
Option A is correct
Step-by-step explanation:
Hope it is helpful....
Answer:
point, 21 along the x-axis and 115 along the y-axis
Step-by-step explanation:
It is the first one, this question is on here several times. Hope I helped