Casio STAT 2 Manual de usuario descargar pdf (Pagina 5)

4 The stem-and-leaf display below represents the number of vitamin supplements sold

be a health food store in a sample of 16 days. Calculate the mean and standard

deviation.

Stem unit = 10

1H 9 9

2L 0 1 2 3

2H 5 6 7

3L 0 3 4

3H 5 6 8

4L 1 Ans. 28.0625; 7.289

5 Consider this frequency table:

Total

Calculate the mean and variance of this distribution. Ans. 4.7; 5.39

6 This frequency distribution was obtained by asking 300 students how many siblings

each one had:

Number of

siblings

Frequency

128

Calculate the mean, variance and standard deviation.

Ans: 2.463; 2.049; 1.431

7 A survey of 100 individuals on credit-card ownership reveals that 15 have no credit

cards, 38 have one only, 43 have two and four people have 3. Calculate the mean

and standard deviation of the number of cards owned per person.

Ans: 1.36; 0.7852

8. An airline collects data on the number of “No shows” which is the number of people

who reserve a seat but do not turn up in time for the flight.

Number of “no shows”

Number of flights

(a) What is the mean number of “no shows”?

(b) What is the standard deviation?

Ans: 0.510; 1.046

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Casio STAT 2 Manual de usuario Pagina 5