Ms. Amani and Mr.Blake each ordered supplies for their classrooms. The cost of the supplies is shown below. Ms. Amani ordered 7
pencil cases and 9 packs of folders. Mr. Blake ordered 9 boxes of crayons. What is the difference in the cost of supplies Ms. Amani ordered and the cost of the supplies Mr.Blake ordered?
2 answers:
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Answer:
a) i) The probability depends on the total number of counters not on the number of colors.
ii) There are 10 number of counters not 4
b)
Step-by-step explanation:
Given that:
Total number of counters in a bag = 10
Number of red counters = 4
Number of green counters = 3
Number of pink counters = 2
Number of blue counters = 1
a) Ella writes: "There are four colors, so the probability of selecting a green is , so the probability is
"
Ella has considered the total type of counters here, which is 4.
But Ella must have considered total number of counters which is 10.
i) The probability depends on the total number of counters not on the number of colors.
ii) There are 10 number of counters not 4
b) There are 4 colors in the bag.
Formula for probability of an event E can be observed as:
To select 2 counters of the same color:
The required probability will be the sum of all 4 above probabilities: