Finding Standard Deviation from a Frequency Distribution. In Exercises 37-40, refer to the frequency distribution in the
Question:
Finding Standard Deviation from a Frequency Distribution. In Exercises 37-40, refer to the frequency distribution in the given exercise and compute the standard deviation by using the formula below, where x represents the class midpoint, f represents the class frequency, and n represents the total number of sample values. Also, compare the computed standard deviations to these standard deviations obtained by using Formula 3-4 with the original list of data values: (Exercise 37) 18.5 minutes; (Exercise 38) 36.7 minutes; (Exercise 39) 6.9 years;
(Exercise 40) 20.4 seconds.
Standard deviation for frequency distribution
s=
n= (f. x2)] - [E(f •x)12
n(n - 1)
Duration of Old Faithful Eruptions (sec)
125-149
150-174
175-199
200-224
225-249
250-274
Frequency
1
0
0
3
34
12
Expert Answer:
To compute the standard deviation from the given frequency distribution well follow these steps 1 Calculate the class midpoints for each class interva... View the full answer
