Make equations to show how he got the 240 and the 960. Move numbers and symbols to the lines to make the equations.
1 answer:
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Answer:
a: 28 < µ < 34
Step-by-step explanation:
We need the mean, var, and standard deviation for the data set. See first attached photo for calculations for these...
We get a mean of 222/7 = 31.7143
and a sample standard deviation of: 4.3079
We can now construct our confidence interval. See the second attached photo for the construction steps.
They want a 90% confidence interval. Our sample size is 7, so since n < 30, we will use a t-score. Look up the value under the 10% area in 2 tails column, and degree of freedom is 6 (degree of freedom is always 1 less than sample size for confidence intervals when n < 30)
The t-value is: 1.943
We rounded down to the nearest person in the interval because we don't want to over estimate. It said 28.55, so more than 28 but not quite 29, so if we use 29 as the lower limit, we could over estimate. It's better to use 28 and underestimate a little when considering customer flow.
Answer:
The equation is .
Step-by-step explanation:
Let represent the number of laps Jay run, and
the number of minutes it takes him to run those laps.
We know that it it takes Jay 25 minutes to run 10 laps; therefore, the number of laps jay runs per minute is:
So, if Jay runs for minutes, the number of laps
he will run be: