4. In a lot, there are 2000 electric bulbs. Among these bulbs, 1800 are good and 500 and bought from company B. out of the good bulbs, 300 are bought from company B. a bulb is randomly selected and found that it is bought frora company B what is the probability that it is a good bulb? 13 marks)

Use set buikder notation to represent the following set: {, -2, -1, 0}

Lems1. the following data set represents the scores on intelligence quotient(iq) examinations of 40 sixth-grade students at a particular school: 114, 122, 103, 118, 99, 105, 134, 125, 117, 106, 109, 104, 111, 127,133, 111, 117, 103, 120, 98, 100, 130, 141, 119, 128, 106, 109, 115,113, 121, 100, 130, 125, 117, 119, 113, 104, 108, 110, 102(a) present this data set in a frequency histogram.(b) which class interval contains the greatest number of data values? (c) is there a roughly equal number of data in each class interval? (d) does the histogram appear to be approximately symmetric? if so,about which interval is it approximately symmetric?

Ihonestly have no clue if it's each or none.