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# maths coursework- ocr higher tier- stats- estimate. HLP!!!! :trytofly:

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Find your uni forum to get talking to other applicants, existing students and your future course-mates 27-07-2015
1. PLS CAN ANY1 HELP IF THEVE ALREDY DONE DA FOLLOWIN COURSEWRK?
ESTIMATE

Brian asked 120 people to estimate the area of a rectangle

These are the estimates people gave to Brian for the area of the rectangle.

All measurements are in square centimetres.

90.5 140.6 180 151.55 112 129.7
100 134.6 168.3 201.3 146.4 132
189 152.25 126.3 141.3 165 147.4
170 188 136.2 144.8 139 126
41.2 100 129 156.2 146.8 146.9
141 111 134.8 155.5 183 157
157.7 161.5 144 119.1 125 125
130 132.2 147.9 151.6 159 154.2
122 129 139.5 146 132 133.7
146.6 155 146.8 158.9 165.3 119
143 121.25 115 166 183 108.2
155.8 149 148.2 146.3 175.9 157.3
118 170 138 129 148.5 166
169.3 137.1 142.6 134.2 93 167.4
111.3 147.3 160 141.8 177 100
139 177.4 184 140 146.2 131.8
135.5 135.5 145 175 250 122
166.2 138 135.8 160 151 133
95 145.4 190 162.6 140 125
147.8 149.5 164 137.4 121.1 169

The area of the rectangle is 145.36cm2

1. Which estimate was closest to the correct answer? 145.4

2. What was the mean estimate? 144.5613

3. Use the data to decide how good at estimating areas these people are

4. Extend your investigation, making clear rules and methods that you use.

I must analyse the estimates that were made for the area of this rectangle. How?????????? i no i must find averages, put em in tables etc.

I know wat i mst do for extention
but were i have to analyse da above how am i suppose to find da mean and median values when i have grouped dem???

this is how ive grouped em:

estimates frequency
0-50 1
50-100 3
100-150 73
150-180 34
180-210 8
210-250 1

dis is da data wen ordered
41.2
90.5
93
95
100
100
100
108.2
111
111.3
112
115
118
119
119.1
121.2
121.25
122
122
125
125
125
126
126.3
129
129
129
129.7
130
131.8
132
132
132.2
133
133.7
134.2
134.6
134.8
135.5
135.5
135.8
136.2
137.1
137.4
138
138
139
139
139.5
140
140
140.6
141
141.3
141.8
142.6
143
144
144.8
145
145.4
146
146.2
146.3
146.4
146.6
146.8
146.8
146.9
147.3
147.4
147.8
147.9
148.2
148.5
149
149.5
151
151.55
151.6
152.25
154.2
155
155.5
155.8
156.2
157
157.3
157.7
158.9
159
160
160
161.5
162.6
164
165
165.3
166
166
166.2
167.4
168.3
169
169.3
170
170
175
175.9
177
177.4
180
183
183
184
188
189
190
201.3
250
total =17347.35
mean= 144.5613
mode=
median=145.2 (60.5th valu)
range=208.8

thanx - if ne 1 cud hlp me id greatly appreciate it!!!
2. (Original post by Sparrohawk)
PLS CAN ANY1 HELP IF THEVE ALREDY DONE DA FOLLOWIN COURSEWRK?
ESTIMATE

Brian asked 120 people to estimate the area of a rectangle

These are the estimates people gave to Brian for the area of the rectangle.

All measurements are in square centimetres.

90.5 140.6 180 151.55 112 129.7
100 134.6 168.3 201.3 146.4 132
189 152.25 126.3 141.3 165 147.4
170 188 136.2 144.8 139 126
41.2 100 129 156.2 146.8 146.9
141 111 134.8 155.5 183 157
157.7 161.5 144 119.1 125 125
130 132.2 147.9 151.6 159 154.2
122 129 139.5 146 132 133.7
146.6 155 146.8 158.9 165.3 119
143 121.25 115 166 183 108.2
155.8 149 148.2 146.3 175.9 157.3
118 170 138 129 148.5 166
169.3 137.1 142.6 134.2 93 167.4
111.3 147.3 160 141.8 177 100
139 177.4 184 140 146.2 131.8
135.5 135.5 145 175 250 122
166.2 138 135.8 160 151 133
95 145.4 190 162.6 140 125
147.8 149.5 164 137.4 121.1 169

The area of the rectangle is 145.36cm2

1. Which estimate was closest to the correct answer? 145.4

2. What was the mean estimate? 144.5613

3. Use the data to decide how good at estimating areas these people are

4. Extend your investigation, making clear rules and methods that you use.

I must analyse the estimates that were made for the area of this rectangle. How?????????? i no i must find averages, put em in tables etc.

I know wat i mst do for extention
but were i have to analyse da above how am i suppose to find da mean and median values when i have grouped dem???

this is how ive grouped em:

estimates frequency
0-50 1
50-100 3
100-150 73
150-180 34
180-210 8
210-250 1

dis is da data wen ordered
41.2
90.5
93
95
100
100
100
108.2
111
111.3
112
115
118
119
119.1
121.2
121.25
122
122
125
125
125
126
126.3
129
129
129
129.7
130
131.8
132
132
132.2
133
133.7
134.2
134.6
134.8
135.5
135.5
135.8
136.2
137.1
137.4
138
138
139
139
139.5
140
140
140.6
141
141.3
141.8
142.6
143
144
144.8
145
145.4
146
146.2
146.3
146.4
146.6
146.8
146.8
146.9
147.3
147.4
147.8
147.9
148.2
148.5
149
149.5
151
151.55
151.6
152.25
154.2
155
155.5
155.8
156.2
157
157.3
157.7
158.9
159
160
160
161.5
162.6
164
165
165.3
166
166
166.2
167.4
168.3
169
169.3
170
170
175
175.9
177
177.4
180
183
183
184
188
189
190
201.3
250
total =17347.35
mean= 144.5613
mode=
median=145.2 (60.5th valu)
range=208.8

thanx - if ne 1 cud hlp me id greatly appreciate it!!!
mode is the most common value. id also work out the standard deviation - shows how srpread out the data is. See the other thread as well
Updated: April 7, 2005
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