11) In order to estimate the number of cars owned per household in KSA, 30 house-holds were randomly selected from the suburbs of Riyadh and Dammam. The numbers of cars owned by those household was determined. The following table: Number of cars Number of owned houses 1 6 2 10 3 6 5 5 3 4 1- The population of our study is a) All cars of the households of KSA. b) The households of KSA. c) The households of Riyadh and Dammam. d) All cars of the households of Riyadh and Dammam e) The people of KSA. 2- The sample of our study is a) All cars of the households of KSA. b) The households of KSA. c) The households of Riyadh and Dammam. d) All cars of the households of Riyadh and Dammam e) The people of Riyadh and Dammam