A survey of 90 students from a high school is conducted. From this sample, it is found that 69 students have sent a text message on their smartphone at least once today, 38 have uploaded at least one "selfie" on their smartphone today, and 22 have done both.
Text Message Have Not Sent a Text Message Total
Have Taken a Selfie 22 16 38
Have Not Taken a Selfie 47 5 52
Total 69 21 90
Complete the rest of the two-way frequency table above.
Part A: How many students have neither sent a text message nor taken a selfie today?
Part B: What percentage of students in the school (rounded to the nearest whole percent) have sent a text message or have taken a selfie at least once today?
+130511 It looks like you have complted the table
The answer to the first question comes from the intersection of the second row with the second column = 5
The answer to the second =
N(Selfie or Text Message) = N(Selfie) + N(Text Message) - N(Selfie and Text Message) =
38 + 69 - 22 =
107 - 22
85
So the percent that have taken a selfie or sent a text message divided by the total surveyed =
85 / 90 = 17/18 = about 94%
