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Cogito

Grade 7 Math · Chapter 9 · Lesson 4

Practice Worksheet

What Actually Happened

Experimental probability against theoretical.

10 problems · about 19 minutes · 7.SP.C.6, 7.SP.C.7

NameDate

Figure — use these to answer the problems

Record what actually came up and compare the two bars.
Heads7
Tails3
Heads7
Tails3
Figure 1

Warm-Up Review

From earlier lessons. Loosen up before the new work.

3 problems

  1. From “Probability as a Number”

    A die. How many outcomes give a number above 4?

    Answer

  2. From “Samples and What They Tell You”

    9 of 30 sampled. In 300, about how many?

    Answer

  3. From “Probability as a Number”

    A fair die. Out of 6, how many outcomes are less than 3?

    Answer

Warm Up

Straightforward practice. Get the method working first.

3 problems

  1. A fair die rolled 120 times. About how many threes are expected?

    Answer

  2. A fair die rolled 60 times. About how many sixes are expected?

    Answer

  3. 50 spins give 30 reds. How many were not red?

    Answer

Build It Up

The same ideas with more to keep track of.

2 problems

  1. Does 7 heads in 10 prove a coin is unfair? 1 for yes, 0 for no.

    Answer

  2. Do more trials usually bring the two closer? 1 for yes, 0 for no.

    Answer

Stretch Yourself

Mixed problems. Work out what kind of question it is before you start.

2 problems

  1. The Flips

    20 flips give 12 heads. How many gave tails?

    Answer

  2. The Expectation

    A fair coin flipped 60 times. About how many heads are expected?

    Answer