How much will it cost for the family of four
1 answer:
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Answer:
Length of the thread = 30 metres
Step-by-step explanation:
Length of the thread in one round of a reel = Circumference of the reel
C =
Since radius of the reel =
=
= 2.5 cm
Circumference of the reel = 2(π)(2.5)
= 5π
= 5×3
= 15 cm
Length of the thread wound in one round around the reel = 15 cm
Since, thread is wound 200 times round a reel, length of the thread
= 200 × 15
= 3000 cm
≈ 30 metres
Therefore, Option (B) will be the answer.
Answer:
0.99
Step-by-step explanation:
Given,
Pink gumballs = 3,
Red gumballs = 4,
Green gumballs = 2,
So, total gumballs = 3 + 4 + 2 = 9,
Thus, total ways of selecting 5 gumball =
Also, the total ways of selecting no red gumballs =
= 1 × 1
= 1
So, the probability of no red gumballs in 5 drawn
Hence, the probability that a red gumball is drawn if there are 5 drawings
= 1 - probability of no red gumballs
≈ 0.99