Question 1182259
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I'll do part (a) to get you started.


Sort the data values from smallest to largest. I strongly recommend using spreadsheet software, though you can sort by hand if you want. 
This is what the sorted list looks like (there are 12 rows and 5 columns to give 12*5 = 60 items total; the order is from left to right, top to bottom)
<table border = "1" cellpadding = "5"><tr><td>83</td><td>85</td><td>88</td><td>89</td><td>90</td></tr><tr><td>100</td><td>101</td><td>102</td><td>104</td><td>106</td></tr><tr><td>108</td><td>108</td><td>109</td><td>109</td><td>110</td></tr><tr><td>110</td><td>111</td><td>112</td><td>113</td><td>113</td></tr><tr><td>113</td><td>114</td><td>114</td><td>115</td><td>115</td></tr><tr><td>115</td><td>115</td><td>116</td><td>116</td><td>117</td></tr><tr><td>117</td><td>117</td><td>117</td><td>118</td><td>118</td></tr><tr><td>119</td><td>119</td><td>120</td><td>120</td><td>121</td></tr><tr><td>121</td><td>122</td><td>122</td><td>123</td><td>126</td></tr><tr><td>126</td><td>127</td><td>128</td><td>130</td><td>132</td></tr><tr><td>133</td><td>134</td><td>137</td><td>137</td><td>138</td></tr><tr><td>140</td><td>142</td><td>143</td><td>147</td><td>149</td></tr></table>


The smallest value in this list is 83. Let's say each class starts at a multiple of 10, meaning that the closest value is 80


The range {{{80 <= x < 90}}} represents a width of 10. We could also say {{{80 <= x <= 89}}} where x is a whole number. I'll go with this second version.


Count how many values are between 80 and 89, inclusive of both endpoints. You should count out 4 values and they are: 83,85,88,89


That means 4 is the frequency for this first class.


The frequency for the class {{{90 <= x <= 99}}} is 1 because there's only one value in this range (the value 90)


Then for the class {{{100 <= x <= 109}}} there are the values {100,101,102,104,106,108,108,109,109} which means the frequency for this class is 9.


Keep going with this process until you have this table 
<table border = "1" cellpadding = "5"><tr><td>Class</td><td>Frequency</td></tr><tr><td>80 to 89</td><td>4</td></tr><tr><td>90 to 99</td><td>1</td></tr><tr><td>100 to 109</td><td>9</td></tr><tr><td>110 to 119</td><td>23</td></tr><tr><td>120 to 129</td><td>11</td></tr><tr><td>130 to 139</td><td>7</td></tr><tr><td>140 to 149</td><td>5</td></tr></table>


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