Colon Hilton
12/28/2023 · Escuela secundaria superior
7.2 A survey was conducted among 150 learners in Grade 10 at a certain school to establish how many of them owned the following devices: smartphone (S) or tablet (T). The results were as follows: - 8 learners did not own either a smartphone or a tablet. 20 learners owned both a smartphone and a tablet. - \( x \) learners owned a tablet. \( 7.2 .1 \quad \) Represent the information above in a Venn diagram. \( 7.2 .2 \quad \) How many learners owned only a smartphone? \( 7.2 .3 \quad \) Calculate the probability that a learner selected at random from this group: (a) Owned only a smartphone (b) Owned at most one type of device
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To find the number of learners who own only a smartphone, we need to solve the equations \( a + b = 122 \) and \( b + 20 = x \). The probability of a learner owning only a smartphone is \( \frac{a}{150} \), and the probability of owning at most one type of device is \( \frac{a + b + 8}{150} \). The exact values of \( a \) and \( b \) will determine the final probabilities.
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