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Date May 2019 Marks available 2 Reference code 19M.1.SL.TZ1.T_5
Level Standard Level Paper Paper 1 (with calculator from previous syllabus) Time zone Time zone 1
Command term Write down Question number T_5 Adapted from N/A

Question

A florist sells bouquets of roses. The florist recorded, in Table 1, the number of roses in each bouquet sold to customers.

Table 1

The roses can be arranged into bouquets of size small, medium or large. The data from Table 1 has been organized into a cumulative frequency table, Table 2.

Table 2

Complete the cumulative frequency table.

[2]
a.

Write down the probability that a bouquet of roses sold is not small.

[2]
b.

A customer buys a large bouquet.

Find the probability that there are 12 roses in this bouquet.

[2]
c.

Markscheme

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

     (A1)(A1)(ft) (C2)

Note: Award (A1) for 10; (A1)(ft) for the last column all correct. Follow through from their 10 for their 50 in the last column.

[2 marks]

a.

35 50 ( 0.7 , 7 10 , 70 )     (A1)(ft)(A1)(ft) (C2)

Note: Award (A1)(ft) for their numerator being 25 + their 10, and (A1)(ft) for their denominator being their 50. Follow through from part (a).

[2 marks]

b.

4 10 ( 0.4 , 2 5 , 40 )    (A1)(A1)(ft) (C2)

Note: Award (A1) for a numerator of 4 and (A1)(ft) for their 10 as denominator. Follow through from part (a).

[2 marks]

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Topic 4—Statistics and probability » SL 4.2—Histograms, CF graphs, box plots
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Topic 4—Statistics and probability » SL 4.6—Combined, mutually exclusive, conditional, independence, prob diagrams
Topic 4—Statistics and probability

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