The expression is 1/2 × (6+3) ÷7
1/2 × (6+3) ÷7
1/2 × 9 ÷7
4.5 ÷7
0.64285714
*Last 6 digits are repeating decimals
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The probability would be 0.000017.
70% of the 20 questions is 14 questions correct. Using a binomial distribution for this, we have:
30×30=900
900/112.5=8 cameras to cover
112.5×4=450
900-450=450 ft left uncovered
Answer:
Stratified sampling
Step-by-step explanation:
In the question, students are selected from subgroups of Sophomore, Junior, and Senior classes.
We are told that 49, 34, and 48 students are selected from the Sophomore, Junior, and Senior classes with 496, 348, and 481 students respectively.
This means that the sample numbers of 49, 34 and 48 students were selected in proportion to the subgroup sizes of 496, 348, and 481 students respectively.
Thus, due to the fact that subgroups were selected & that sample number of students were also selected in proportion to their respective subgroup sizes, this is therefore a stratified sampling.
First you add up how much the teenagers were in total and that would be $15 then add up children then thats $32 add the teen and children thats $47 than didvids 5300 by 47 and thats 112.7 then round 123 and divide by 6 and thats 20.5 then its equal to 21 adults.
