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TEST TIME
(Probability forms the backbone of many important data science concepts. It would not be wrong to say that the journey of mastering statistics begins with probability. This skill test is conducted to help you identify your basic skill level in probability & statistics)
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1. Alice has 2 kids and one of them is a girl. What is the probability that the other child is also a girl? You can assume that there are an equal number of males and females in the world.
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2 points
0.25
0.75
0.333
0.5
2. The weather forecast states there's a 20% chance it will rain all day tomorrow & a 10% chance it will snow all day tomorrow, otherwise it will be clear. What's the probability it will be clear?
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1 point
20%
70%
30%
impossible to say
3. If the mean weight of 4 watermelon is 18kg & the mean weight of 3 of them is 16kg, what is the weight of the fourth melon?
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1 point
32kg
17kg
24kg
20kg
4. The ages of six children in Maria's family are 5,7,8,9,12 & 14. What is the mean age to the nearest month?
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2 points
8yr 10m
8yr 8m
9yr 2m
9yr 0m
5. Charlie picks a card from a wellshuffled deck. What's the chance it's not a picture card?
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1 point
3/4
10/13
12/13
43/52
6. You have a box of chocolates : 4 caramels, 3 soft centers & 2 hazelnut. You pick one randomly. What's the probability it's a soft center?
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1 point
4/9
2/9
1/3
5/9
7. Riya throws a dice. What's the chance it's not 4 or less?
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2 points
2/3
1/2
1/3
5/6
8. The number of goals score in the season : (0, 0, 3, 1, 2, 2, 5, 0, 3, 2). What is the average number of goals scored per game
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1 point
1.8
2
2.2
5
9. Hary knows that his average score for the 5 math test is 72%. He knows four of the marks were 58%, 80%, 65%, & 73%. What was his marks in fifth test?
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2 points
87%
72%
95%
84%
10. Niya is monitoring the weight of 10 mice. The mean weight of 9 of them is 25g & the 10th mouse weighs 27g. What is the mean weight of 10 mice?
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2 points
25.5g
25.7g
25.2g
25.1g
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