1)The following table shows the distribution of the monthly salaries of different posts in a restaurant.
---Post----Monthly-----Number of employees
Manager---$32000-------------1
Cook-------$15000-------------2
Waiter-----$7000---------------5
A.)Jacky,one of the waiter,thinks that the average monthly salary of all the posts of the restaurant is $7000.Which measure of central tendency does he use?
B.)However,the manager claims that the average monthly salary of all the post is $12125.Is his conclusion reasonable?Explain your answer.
2)The English examination incldes four parts:composition,comprehension,listening and speaking.The weights of the four parts are 3,2,1 and 1 respectively.Mary's result is shown in the following table.
----Parts----------------------Marks
Composition------------------45
Comprehension---------------54
Listening----------------------79
Speaking----------------------70
Which measure of central tendency does the examination use?
3)The owner of a bakery records the number of loafs of bread sold every day.The result are shown below.
Number of loafs of bread-------------Frequency
80-89---------------------------------------7
90-99--------------------------------------17
100-109------------------------------------4
110-119------------------------------------7
120-129------------------------------------5
A.)After analysing the above data,the owner thinks that the average number of loafs of bread sold every day is 101.Which measure of central tendency does he use?
B.)According to the result in part (a),the owner decides to produce 101 loafs of bread every day onwards.Do you think the decision of the owner is reasonable?Explain your answer.
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4)In a country,an observatory records an average of 0.5 day with typhoon signals in November from 1986 to 2005.According to the record,what is the probability of hoisting a typhoon signal in November this year?