Casio STAT 2 Manual de usuario descargar pdf (Pagina 4)

To enter grouped data:

You enter grouped data in the same way as above, but you will need to find the mid point

of each interval to use as your X value

For example

Freq

[148, 152)

[152, 156)

[156, 160)

[160. 164)

[164, 168)

[168, 172)

[172, 176)

Midpoints for each of these intervals are 150, 154, 158, 162, 166, 170 and 174 respectively.

Using these values and the frequency for each, enter the data as shown for a frequency

distribution – that is, (150,3) (154, 9), (158, 13), (162, 15), (166, 7), (170, 2) and (174, 1).

Results should be

314.5,261.5,92.159,50 

sxn



Practice:

The following are a selection from past exam papers:

1. The following data shows the amount spent ($) on textbooks by a random sample of 15

students.

105

230

157

128

110

123

a. Calculate the mean. b. Calculate the value of s

Ans: $97.67 and $2873.5

2. In a recent study of the weights (kg) of newborn babies delivered at a local hospital, a

sample of 10 weights was obtained:

3.5 3.5 3.7 3.1 3.4

4.0 3.4 3.3 3.6 2.9

Calculate the sample mean and standard deviation. Ans: 3.44 and 0.306

3 Use the following information to answer questions (a) and (b):

2.2 2.7 3.8 4.5 4.9 8.7 9.6

(a) What is the mean? (b) What is the standard deviation? Ans: 5.2 and 2.869

1 2 3 4 5 6 7 8

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Casio STAT 2 Manual de usuario Pagina 4